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Novels
- Crucible of Evil (1974)
- Crucible of Evil (1974) with Lyda Belknap Long
- Cuando el robot se impuso [Spanish] (1964)
- De fremmede [Norwegian (Bokmal)] (1971)
- Die Marsfestung [German] (1959)
- El día del robot [Spanish] (1967)
- Es kam aus der Tiefe [German] (1977)
- Fire of the Witches (1971)
- Fire of the Witches (1971) with Lyda Belknap Long
- House of the Deadly Nightshade (1972)
- House of the Deadly Nightshade (1972) with Lyda Belknap Long
- In una piccola città [Italian] (1991)
- It Was the Day of the Robot (1963)
- Journey Into Darkness (1967)
- Legacy of Evil (1973)
- Legacy of Evil (1973) with Lyda Belknap Long
- Lest Earth Be Conquered (1966)
- Mars Is My Destination (1962)
- Marte es mi destino [Spanish] (1963)
- Mission to a Distant Star (1964)
- Mission to a Star (1964)
- Monster from Out of Time (1970)
- Rumstation Eet kalder [Danish] (1959)
- Rymdresenär kidnappas [Swedish] (1959)
- So Dark a Heritage (1966)
- Space Station #1 (1957)
- Space Station 1 (1957)
- Survival World (1971)
- The Androids (1966)
- The Horror from the Hills (1963)
- The Lemoyne Heritage (1977)
- The Lemoyne Heritage (1977) with Lyda Belknap Long
- The Martian Visitors (1964)
- The Martian Visitors (1964) with Frank B. Long
- The Mating Center (1961)
- The Night of the Wolf (1972)
- The Shape of Fear (1971)
- The Shape of Fear (1971) with Lyda Belknap Long
- The Three Faces of Time (1969)
- The Witch Tree (1971)
- The Witch Tree (1971) with Lyda Belknap Long
- This Strange Tomorrow (1966)
- Three Steps Spaceward (1963)
- Three Steps Spaceward (1963) with Frank B. Long
- To the Dark Tower (1969)
- To the Dark Tower (1969) with Lyda Belknap Long
- Woman from Another Planet (1960)
- A Man from Genoa and Other Poems (1926)
- A Man from Genoa and Other Poems (1926) with Frank Belknap Long, Jr.
- Das Grauen aus den Bergen [German] (2013) with H. P. Lovecraft
- Di Fronte All'ignoto [Italian] (1995)
- Escape from Tomorrow: 3 Previously Unreprinted Weird Tales (1995)
- Frank Belknap Long (2010)
- Frank Belknap Long (2022)
- In Mayan Splendor (1977)
- John Carstairs: Space Detective (1949)
- L'universo della paura [Italian] (1991)
- Las bestias oscuras [Spanish] (1970)
- Le druide noir [French] (1977)
- Le gnome rouge [French] (1975)
- Night Fear (1979)
- Odd Science Fiction (1964)
- The 8th Golden Age of Weird Fiction Megapack: Frank Belknap Long, Volume 1 (2016)
- The 9th Golden Age of Weird Fiction Megapack: Frank Belknap Long, Volume 2 (2016)
- The Black Druid and Other Stories (1975)
- The Dark Beasts and Eight Other Stories from the Hounds of Tindalos (1964)
- The Early Long (1975)
- The Eye Above the Mantel & Other Stories (1995)
- The Frank Belknap Long Science Fiction MEGAPACK® (2016)
- The Frank Belknap Long Science Fiction Novel Megapack (2016)
- The Goblin Tower (1935)
- The Goblin Tower (1935) with Frank Belknap Long, Jr.
- The Golden Age of Weird Fiction: Frank Belknap Long: Volume One (2016)
- The Horror from the Hills (1965)
- The Hounds of Tindalos (1946)
- The Hounds of Tindalos (1963)
- The Hounds of Tindalos (1975)
- The Hounds of Tindalos (1978)
- The Man Who Died Twice (and Three Others) (2009)
- The Rim of the Unknown (1972)
- The Second Frank Belknap Long Science Fiction Megapack: 22 Classic Stories (2016)
- The Third Frank Belknap Long Science Fiction Megapack (2016)
- È Bello Essere Marziani [Italian] (1995) with Frank B. Long
- Empire of the Atom / Space Station No. 1 (1957) [O/2N] with A. E. van Vogt
- Full Cycle / It Was the Day of the Robot (2012) [O] with Clifford D. Simak
- Mission to a Distant Star (2020) [O]
- Il caso della ragazza mascherata (Complete Novel) [Italian] (1964)
- In una piccola città (Complete Novel) [Italian] (1969)
- Mission to a Distant Star (Complete Novel) (1958)
- The Challenge from Beyond (Part 1 of 5) (1935) with C. L. Moore
- The Challenge from Beyond (Part 2 of 5) (1935) with A. Merritt
- The Challenge from Beyond (Part 3 of 5) (1935) with H. P. Lovecraft
- The Challenge from Beyond (Part 4 of 5) (1935) with Robert E. Howard
- The Challenge from Beyond (Part 5 of 5) (1935) with Frank Belknap Long, Jr.
- The Horror from the Hills (Part 1 of 2) (1931) with Frank Belknap Long, Jr.
- The Horror from the Hills (Part 2 of 2) (1931) with Frank Belknap Long, Jr.
- Mission to a Distant Star: Science Fiction Triple Feature (2012)
- The Challenge from Beyond (1990) with Robert E. Howard and Murray Leinster and H. P. Lovecraft and A. Merritt and C. L. Moore and Edward E. Smith and Harl Vincent and Donald Wandrei and Stanley G. Weinbaum
- The Challenge from Beyond (1990) with Robert E. Howard and Murray Leinster and H. P. Lovecraft and A. Merritt and C. L. Moore and E. E. Smith and Harl Vincent and Donald Wandrei and Stanley G. Weinbaum
- The Thief of Thoth / ... And Others Shall Be Born (1968) with Lin Carter
- And We Sailed the Mighty Dark (2022)
- Atomic Station (2022)
- Fuzzy Head (2023)
- Galactic Heritage (2023)
- Lake of Fire (2020)
- Little Men of Space (2023)
- Manhunt (2019)
- Mr. Caxton Draws a Martian Bird (2024)
- The Calm Man (2009)
- The Challenge from Beyond (1954) with Robert E. Howard and H. P. Lovecraft and A. Merritt and C. L. Moore
- The Challenge from Beyond Drafts (2020) with Robert E. Howard and H. P. Lovecraft and A. Merritt and C. L. Moore
- The Great Cold (2019)
- The Man from Time (2009)
- The Man the Martians Made (2009)
- The Mercurian (2020)
- The Miniature Menace (2023)
- The Mississippi Saucer (2007)
- The Sky Trap (2008)
- The Timeless Ones (2020)
- The Vibration Wasps (2021)
- Time Trap (2020)
-
Χάουαρντ Φίλιπς Λάβκραφτ: Ο ονειρευτής των νυχτερινών τόπων?Chaoearnt Filips Lavkraft: O oneireetes ton nechterinon topon[Greek] (2018)
- Autobiographical Memoir (1985)
- Howard Phillips Lovecraft: Dreamer on the Nightside (1975)
- Lovecraft e le ombre [Italian] (2011)
- Mein Freund H. P. Lovecraft [German] (2016)
-
Океанският кръвопиец?Okeanskiyat kravopiets[Bulgarian] (2004) withФранк Белкнап Лонг?Frank Belknap Long
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ティンダロウスの犬?Tindarousu no Inu[Japanese] (1972)
- ... And Others Shall Be Born (1968)
- A Dangerous Experiment (1934)
- A Guest in the House (1946)
- A Lion in Your Lap (1954)
- A Lion in Your Lap (1954) with Frank Doty
- A Stitch in Time (1940)
- A Stitch in Time (1940) with Frank Belknap Long, Jr.
- A Visitor from Egypt (1930)
- A Visitor from Egypt (1930) with Frank Belknap Long, Jr.
- Acque mortali [Italian] (1991)
- Alias the Living (1944)
- Alias the Living (1944) with Frank B. Long
- And Someday to Mars (1952)
- And We Sailed the Mighty Dark (1948)
- Anteprima [Italian] (1995) with Frank B. Long
- Atomic Station (1946)
- Beyond the Vortex (1944)
- Black Demons Dance (1936)
- Black Demons Dance (1936) with Frank Belknap Long, Jr.
- Bridgehead (1944)
- Brown (1941)
- Carnival of Crawling Doom (1937)
- Carnival of Crawling Doom (1937) with Frank Belknap Long, Jr.
- Castaways in Two Dimensions (1945)
-
Cela va être votre tour?Cela va etre votre tour[French] (1975)
- Census Taker (1942)
- Cigarette Characterization #4 (1934)
- Cigarette Characterization #4 (1934) with Frank Belknap Long, Jr.
- Circle of Youth (1943)
- Collector's Item (1947)
- Cones (1936)
- Coni [Italian] (1995) with Frank B. Long
- Cottage Tenant (1975)
- Courtship of the Vampire (1939)
- Courtship of the Vampire (1939) with Frank Belknap Long, Jr.
- Dark Awakening (1980)
- Dark Command (1945)
- Dark Vision (1939)
- Das Grauen aus den Bergen [German] (2013)
- De honden van Tindalos [Dutch] (1973)
- De ruimte-eters [Dutch] (1974)
- Death Waters (1924)
- Death-Waters (1924)
- Death-Waters (1924) with Frank Belknap Long, Jr.
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Den anden nat til søs?Den anden nat til soes[Danish] (1965)
- Der Mann mit den tausend Beinen [German] (1971)
- Der Weltraumfresser [German] (2023) with Frank Belknap Long, Jr.
- Descenderá hacia ti [Spanish] (1970)
- Destination Unknown (1942)
- Die Bedrohung aus dem Weltraum [German] (2000) with Robert E. Howard and H. P. Lovecraft and Abraham Merritt and C. L. Moore
- Die Dämonen von Tindalos [German] (1991)
- Die Furcht vor dem Dunkel [German] (1968)
- Die Hunde des Tindalos [German] (2003)
- Die Hunde des Tindalos [German] (2023) with Frank Belknap Long, Jr.
- Die Unsichtbaren [German] (1972) with Frank Belknap Long, Jr.
- Die Weltraumfresser [German] (2013)
- Die zwei Gesichter [German] (1969)
- Diploma Time (1983)
- Discovery Time (1985)
- Dr. Whitlock's Price (1920)
- Eaux de mort [French] (1970) with Frank Belknap Long, Jr.
- Ein Hauch von Barbarei [German] (1968) with Frank B. Long
- El elemental [Spanish] (1966) with Frank Belknap
- El enano llameante [Spanish] (1970)
- El hombrecillo del censo [Spanish] (1970)
- Entra en mi jardin [Spanish] (1970)
- Entre aguas mortales [Spanish] (1970)
- Escape from Tomorrow (1939)
- Escape from Tomorrow (1939) with Frank Belknap Long, Jr.
- Exiles of the Stratosphere (1935)
- Fait sur mesure [French] (1961)
- Fatal Thoughts (1945)
- Fatal Thoughts (1945) with Leslie Northern
- Filch (1945)
- Fisherman's Luck (1940)
- Flame of Life (1939)
- Flame of Life (1939) with Frank Belknap Long, Jr.
- Fuzzy Head (1948)
- Fußgänger der Luft [German] (2023) with Frank Belknap Long, Jr.
- Galactic Heritage (1948)
- Gateway to Forever (1984)
- Giant in the Forest (1955)
- Giants in the Sky (1939)
- Giants in the Sky (1939) with Frank Belknap Long, Jr.
- Gli esuli [Italian] (1991)
- Gli Occhiali [Italian] (1995) with Frank B. Long
- Gli Ultimi Uomini [Italian] (1995) with Frank B. Long
- Gloria Verde [Italian] (1995) with Frank B. Long
- Golden Child (1945)
- Good to Be a Martian (1955)
- Grab Bags Are Dangerous (1942)
- Green Glory (1935)
- Grieta en el tiempo [Spanish] (1970)
- Guest in the House (1946)
- Harvest of Death (1936)
- He Came at Dusk (1944)
- Homecoming (1983)
- Humpty Dumpty [German] (1957)
- Humpty Dumpty Had a Great Fall (1948)
- I mangiatori di spazio [Italian] (1991)
- I segugi di Tindalos [Italian] (1987)
- If You Don't Watch Out (1950)
- Il bosco delle rane [Italian] (1979)
- Il Druido nero [Italian] (1991)
- Il Grande Freddo [Italian] (1995) with Frank B. Long
- Il Mondo Di Wulkins [Italian] (1995)
- Il pettegolo [Italian] (1991)
- Il Signor Caxton Disegna Un Uccello Marziano [Italian] (1995)
- Il visitatore dall'Egitto [Italian] (1991)
- In the Lair of the Space Monsters (1932)
- In the Lair of the Space Monsters (1932) with Frank B. Long, Jr.
- In the Tomb of Semenses (1921)
- Invaders from the Outer Suns (1937)
- Invaders from the Outer Suns (1937) with Frank Belknap Long, Jr.
- Invasion (1950)
- It Will Come to You (1942)
- J'aime mieux ma mie o gué... [French] (1962)
- John Dee's Necronomicon: A Fragment (1996)
- Johnny on the Spot (1939)
- Johnny on the Spot (1939) with Frank Belknap Long, Jr.
- Kegel [German] (1958)
- L'elementale [Italian] (1991)
-
L'esprit élémentaire?L'esprit elementaire[French] (1977)
- L'homoncule de flamme [French] (1971)
- L'intelligenza Spiraliforme [Italian] (1995)
- L'omuncolo di fiamma [Italian] (1991)
- L'uomo Dalle Mille Gambe [Italian] (1995)
- L'uomo del censimento [Italian] (1991)
- L'uomo Venuto Dal Tempo [Italian] (1995) with Frank B. Long
- La bimba d'oro [Italian] (1991)
- La Casa Del Vento Nascente [Italian] (1995)
- La Casetta [Italian] (1995) with Frank B. Long
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La chance du pêcheur?La chance du pecheur[French] (1977)
- La Deuxième nuit en mer [French] (1967)
- La fortuna del pescatore [Italian] (1991)
- La monogamia è delitto [Italian] (1967)
- La mort surgie des eaux [French] (1975)
- La petite fille en or [French] (1977)
-
La sangsue de l'océan?La sangsue de l'ocean[French] (1975)
- La sanguijuela en el océano [Spanish] (1970)
- La sanguisuga oceanica [Italian] (1991)
- La seconda notte fuori [Italian] (1991)
- La seconde nuit [French] (1977)
- La segunda noche en el mar [Spanish] (1967) with Frank Belknap Long, Jr.
- La Trappola [Italian] (1995)
-
La tête de pont?La tete de pont[French] (1977)
- Ladruncoli [Italian] (1995) with Frank B. Long
- Lake of Fire (1951)
- Las bestias oscuras [Spanish] (1970)
- Le bestie nere [Italian] (1991)
- Le borse magiche sono pericolose [Italian] (1991)
- Le Creature [Italian] (1995) with Frank B. Long
- Le curieux [French] (1977)
-
Le danger des sacs à malice?Le danger des sacs a malice[French] (1977)
- Le druide noir [French] (1977)
- Le défi d'outre-espace [French] (1993) with Robert E. Howard and Howard P. Lovecraft and A. Merritt and C. L. Moore
-
Le défi de l'au-delà?Le defi de l'au-dela[French] (1975) with Robert E. Howard and Frank Belknap Long, Jr. and H. P. Lovecraft and Abraham Merritt and Catherine L. Moore
- Le défi de l'au-delà [French] (1984) with Robert E. Howard and H. P. Lovecraft and Abraham Merritt and Catherine L. Moore
- Le gnome rouge [French] (1975)
- Le grand froid [French] (1985)
- Le recenseur [French] (1975)
- Les chiens de Tindalos [French] (1965)
- Les chiens de Tindalos [French] (1972)
- Les chiens de Tindalos [French] (1975) with Frank Belknap Long, Jr.
- Les chiens de Tindalos [French] (2000)
- Les mangeuses d'espace [French] (1972)
-
Les réfugiés?Les refugies[French] (1975)
-
Les vilaines bêtes?Les vilaines betes[French] (1975)
- Lesson in Survival (1952)
- Lezione Di Sopravvivenza [Italian] (1995) with Frank B. Long
- Little Men of Space (1953)
- Long, Long Ago (1941)
- Los refugiados [Spanish] (1970)
- Lost Planet (1934)
- Lost Planet (1934) with Frank Belknap Long, Jr.
- Lover in the Wildwood (1986)
- Made to Order (1957)
- Man of Distinction (1954)
- Manhunt (1954)
- Martian Homecoming (1951)
- Maturity Night (1949)
- Men Who Walk Upon the Air (1925)
- Men Who Walk Upon the Air (1925) with Frank Belknap Long, Jr.
- Mind Out of Time (1938)
- Mr. Caxton Draws a Martian Bird (1954)
- Museum (1951)
- Nel mio giardino [Italian] (1991)
- Night Fear (1953)
- Night-Fear (1953)
- Operation: Square Peg (1957) with Irving W. Lande
- Os Cães de Tindalos [Portuguese] (1977) with Frank Belknap Long, Jr.
- Paradiso sospetto [Italian] (1965)
- Piccoli Uomini Nello Spazio [Italian] (1995) with Frank B. Long
- Plants Must Grow (1941)
- Plants Must Slay (1942)
- Preview (1956)
- Prison Bright, Prison Deep (1950)
- Prisoners in Flat Land (1941)
- Prisoners in Flatland (1941)
- Problem Child (1983)
- Rebirth (1955)
- Red Moon (1940)
- Red Moon (1940) with Frank Belknap Long, Jr.
- Red Storm on Jupiter (1936)
- Red Storm on Jupiter (1936) with Frank Belknap Long, Jr.
- Rehearsal Night (1984)
- Return of the Undead (1943) with Otis Adelbert Kline
- Riddle of the Deadly Paradise (1958)
- Riddle of the Deadly Paradise (1958) with Charles Long
- Satellite of Peril (1942)
- Sauce for the Gander (1988)
- Second Night Out (1946)
- Shadow Over Venus (1946)
- Skyrock (1935)
- Skyrock (1935) with Frank B. Long, Jr.
- Skyrover (1945)
- Skyrover (1945) with Leslie Northern
- Snapdragon (1941)
- Sombre vision [French] (1977)
-
Sombre éveil?Sombre eveil[French] (1991)
- Son of His Father (1943)
- Spawn of the Further Dark (1944)
- Spawn of the Red Giants (1937)
- Spawn of the Red Giants (1937) with Frank Belknap Long, Jr.
- Star Comrades (1943)
- Step Into My Garden (1942)
- Sturz von der Mauer [German] (1957)
- Temporary Warp (1937)
- Temporary Warp (1937) with Frank Belknap Long, Jr.
- Terrore al microscopio [Italian] (1965)
- Testa D'uovo Fa Un Bel Capitombolo [Italian] (1995)
- Testa Riccia [Italian] (1995) with Frank B. Long
- The Autumn Visitors (1982)
- The Beast Helper (2010)
- The Beast-Helper (1934)
- The Beast-Helper (1934) with Frank Belknap Long, Jr.
- The Black Druid (1930)
- The Black Druid (1930) with Frank Belknap Long, Jr.
- The Black Vortex (1937)
- The Black, Dead Thing (1933)
- The Black, Dead Thing (1933) with Frank Belknap Long, Jr.
- The Blue Earthman (1935)
- The Body-Masters (1935)
- The Body-Masters (1935) with Frank Belknap Long, Jr.
- The Brain-Eaters (1932)
- The Brain-Eaters (1932) with Frank Belknap Long, Jr.
- The Calm Man (1954)
- The Census Taker (1942)
- The Challenge from Beyond (1935) with Robert E. Howard and H. P. Lovecraft and A. Merritt and C. L. Moore
- The Challenge from Beyond (1935) with H. P. Lovecraft
- The Challenge from Beyond (1935) with Robert E. Howard and Frank Belknap Long, Jr. and H. P. Lovecraft and A. Merritt and C. L. Moore
- The Challenge from Beyond (2015) with Robert E. Howard
- The Corpse's Alibi (1939)
- The Corpse's Alibi (1939) with Frank Belknap Long, Jr.
- The Cottage (1954)
- The Creeper in Darkness (1939)
- The Creeper in Darkness (1939) with Frank Belknap Long, Jr.
- The Critters (1945)
- The Dark Beasts (1934)
- The Dark Beasts (1934) with Frank B. Long, Jr.
- The Desert Lich (1924)
- The Desert Lich (1924) with Frank Belknap Long, Jr.
- The Devil-God (1925)
- The Devil-God (1925) with Frank Belknap Long, Jr.
- The Dog-Eared God (1926)
- The Dog-Eared God (1926) with Frank Belknap Long, Jr.
- The Dweller in Outer Darkness (1939)
- The Electronic Frankenstein Affair (1967)
- The Electronic Frankenstein Affair (1967) with Robert Hart Davis
- The Elemental (1939)
- The Elemental (1939) with Frank Belknap Long, Jr.
- The Ether Robots (1942)
- The Eye Above the Mantel (1921)
- The Eye Above the Mantle (2011)
- The Flame Midget (1936)
- The Flame Midget (1936) with Frank Belknap Long, Jr.
- The Flame of Life (1959)
- The Gift of Lycanthropy (Part 12 of 17) (1979)
- The Glory Flight (1943)
- The Golden Calf (1957)
- The Golden Child (2010)
- The Great Cold (1935)
- The Heavy Man (1943)
- The Hollow World (1945)
- The Horizontals (1940)
- The Horror at Cut-Off Cove (1936)
- The Horror from the Hills (1931)
- The Horror in the Hold (1932)
- The Horror in the Hold (1932) with Frank Belknap Long, Jr.
- The Hounds of Tindalos (1929)
- The Hounds of Tindalos (1929) with Frank Belknap Long, Jr.
- The House of Rising Winds (1948)
- The Infants from Hell (1937)
- The Last Men (1934)
- The Last Men (1934) with Frank Belknap Long, Jr.
- The Lichen from Eros (1935)
- The Lichen from Eros (1935) with Frank Belknap Long, Jr.
- The Love-Slave and the Scientists (1935)
- The Malignant Invader (1932)
- The Malignant Invader (1932) with Frank Belknap Long, Jr.
- The Man from Nowhere (1940)
- The Man from Nowhere (1940) with Frank Belknap Long, Jr.
- The Man from Time (1954)
- The Man the Martians Made (1954)
- The Man Who Died Twice (1927)
- The Man Who Died Twice (1927) with Frank Belknap Long, Jr.
- The Man with a Thousand Legs (1927)
- The Man with a Thousand Legs (1927) with Frank Belknap Long, Jr.
- The Mercurian (1941)
- The Miniature Menace (1950)
- The Mississippi Saucer (1951)
- The Necronomicon, John Dee's Translation (1984)
- The Ocean Leech (1925)
- The Ocean Leech (1925) with Frank Belknap Long, Jr.
- The Pearl Robber (1931)
- The Pearl Robber (1931) with Frank Belknap Long, Jr.
- The Peeper (1944)
- The Plague from Tomorrow (1941)
- The Purple Dusk (1945)
- The Purple Dusk (1945) with Leslie Northern
- The Rajah's Grandmother (1931)
- The Rajah's Grandmother (1931) with Frank Belknap Long, Jr.
- The Red Fetish (1930)
- The Red Fetish (1930) with Frank Belknap Long, Jr.
- The Refugees (1942)
- The Roaring Blot (1936)
- The Roaring Blot (1936) with Frank Belknap Long, Jr.
- The Robot Empire (1934)
- The Sea Thing (1925)
- The Sea Thing (1925) with Frank Belknap Long, Jr.
- The Shadow Dwellers (1945)
- The Sky Trap (1941)
- The Snake God Kills (1937)
- The Soaring (1987)
- The Space Eaters (1974)
- The Space-Eaters (1928)
- The Space-Eaters (1928) with Frank Belknap Long, Jr.
- The Spectacles (1956)
- The Spiral Intelligence (1953)
- The Stellar Vampires (1943)
- The Temporal Transgressor (1954)
- The Thought Materializer (1930)
- The Thought Materializer (1930) with F. B. Long, Jr.
- The Timeless Man (1949)
- The Timeless Ones (1951)
- The Trap (1945)
- The Unfinished (1951)
- The Vapor Death (1934)
- The Vibration Wasps (1941)
- The Were-Snake (1925)
- The Were-Snake (1925) with Frank Belknap Long, Jr.
- The World of Wulkins (1948)
- They Sculp (1945)
- They Sculp (1945) with Leslie Northern
- Throwback in Time (1953)
- Time Trap (1948)
- To Follow Knowledge (1942)
- Two Against Neptune (1941)
- Two Face (1950)
- Two Way Destiny (1954)
-
Tödliches Gewässer?Toedliches Gewaesser[German] (2023) with Frank Belknap Long, Jr.
- Un Ospite In Casa [Italian] (1995)
- Un pas dans mon jardin [French] (1975)
- Un punto nel tempo [Italian] (1991)
- Un Uomo Distinto [Italian] (1995) with Frank B. Long
- Un visitatore dall'Egitto [Italian] (1990)
- Un visitatore dell'Egitto [Italian] (1988)
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Un visiteur venu d'Égypte?Un visiteur venu d'Egypte[French] (1977)
- Une faille dans le temps [French] (1975)
- Verrà da te [Italian] (1991)
- Visione oscura [Italian] (1991)
- We, the Invisible (1938)
- We, the Invisible (1970) with Frank Belknap Long, Jr.
- When the Rains Came (1964)
- White Barrier (1939)
- Willie (1943)
- Wobblies in the Moon (1943)
- Woman Out of Time (1940)
- Woodland Burial (1981)
- You Can't Kill a Ghost (1928)
- You Can't Kill a Ghost (1928) with Frank Belknap Long, Jr.
- Young Man with a Trumpet (1956)
- È Bello Essere Marziani [Italian] (1995) with Frank B. Long
- A Knight of La Mancha (1925)
- A Man from Genoa (1926) with Frank Belknap Long, Jr.
- A Man from Genoa (1974)
- A Sonnet for Seamen (1977)
- A Time Will Come (1977)
- Adjuration (1961)
- Advice (1927)
- Advice (1927) with Frank Belknap Long, Jr.
- An Old Tale Retold (1977)
- An Old Wife Speaketh It (1935)
- At the Home of Poe (1922)
- At the Home of Poe (2014) with Frank Belknap Long, Jr.
- Ballad of Mary Magdalene (1935)
- Ballad of Mary Magdalene (1935) with Frank Belknap Long, Jr.
- Ballad of Saint Anthony (1927)
- Ballad of St. Anthony (1927) with Frank Belknap Long, Jr.
- Come, Let Us Make (1986)
- Exotic Quest (1935)
- Exotic Quest (1935) with Frank Belknap Long, Jr.
- Felis (1923)
- Felis: A Prose Poem (2022)
- Florence (1977)
- From the Catullian Fount (1935)
- From the Catullian Fount (1935) with Frank Belknap Long, Jr.
- Futility (1938)
- Futility (1938) with Frank Belknap Long, Jr.
- Great Ashtoreth (1930)
- Great Ashtoreth (1930) with Frank Belknap Long, Jr.
- H. P. Lovecraft (1938)
- H. P. Lovecraft (1938) with Frank Belknap Long, Jr.
- H. P. Lovecraft [German] (2000)
- In Antique Mood (1977)
- In Hospital (1977)
- In Mayan Splendor (1934)
- In Mayan Splendor (1934) with Frank Belknap Long, Jr.
- In the Garden of Eros (1977)
- It Is Not Only the Dead (1961)
- Man Is the Sea's Child (1976)
- Manhattan Skyline (1926)
- Manhattan Skyline (1926) with Frank Belknap Long, Jr.
- Martial: The Vacationist (1935)
- Martial: The Vacationist (1935) with Frank Belknap Long, Jr.
- Medieval Palimpsest Fragment, AD 1165 (1985)
- Night Trees (1928)
- Night Trees (1928) with Frank Belknap Long, Jr.
- Night-Trees (1977)
- O Is There Aught in Wine and Ships? (1938)
- O Is There Aught in Wine and Ships? (1938) with Frank Belknap Long, Jr.
- Old Wife Speaketh It (1935) with Frank Belknap Long, Jr.
- On Icy Kinarth (1930)
- On Icy Kinarth (1930) with Frank Belknap Long, Jr.
- On Reading Arthur Machen (1925)
- On Reading Arthur Machen (1926) with Frank Belknap Long, Jr.
- Pirate-Men (1935)
- Pirate-Men (1935) with Frank Belknap Long, Jr.
- Prediction (1935)
- Prophecy (1985)
- Rufus (Catallus) (1986)
- Sonnet (1935)
- Sonnet (1935) with Frank Belknap Long, Jr.
- Stallions of the Moon (1925)
- Stallions of the Moon (1925) with Frank Belknap Long, Jr.
- Subway (1935)
- Subway (1935) with Frank Belknap Long, Jr.
- The Abominable Snow Men (1931)
- The Abominable Snow Men (1931) with Frank Belknap Long, Jr.
- The Beautiful City (1937)
- The Beautiful City (1937) with Frank Belknap Long, Jr.
- The Goblin Tower (1935)
- The Goblin Tower (1935) with Frank Belknap Long, Jr.
- The Hashish Eater (1935)
- The Hashish Eater (1935) with Frank Belknap Long, Jr.
- The Horror on Dagoth Wold (1930)
- The Horror on Dagoth Wold (1930) with Frank Belknap Long, Jr.
- The Inland Sea (1926)
- The Inland Sea (1926) with Frank Belknap Long, Jr.
- The Magi (1977)
- The Marriage of Sir John de Mandeville (1926)
- The Marriage of Sir John de Mandeville (1926) with Frank Belknap Long, Jr.
- The New Adam (1961)
- The Prophet (1926)
- The Prophet (1926) with Frank Belknap Long, Jr.
- The Rebel (1977)
- The Sea's Cold Blueness (1984)
- The White People (1927)
- The White People (1927) with Frank Belknap Long, Jr.
- To a Friend (1985)
- Two Stanzas for Master Francois Villon (1926) with Frank Belknap Long, Jr.
- Two Stanzas for Master François Villon (1926)
- W. W. (1977)
- Walt Whitman (1935)
- West Indies (1935)
- West Indies (1935) with Frank Belknap Long, Jr.
- When Chaugnar Wakes (1932)
- When Chaugnar Wakes (1932) with Frank Belknap Long, Jr.
- When We Have Seen (1977)
- An Autobiographical Memoir (1985)
- Author's Note (Cottage Tenant) (1988)
- Epilogue: Lovecraft and Poe (1975)
- Erinnerungen an Weird Tales [German] (2023)
- Foreword (Pulptime) (1984)
- Foreword (The Chronicles of Lucius Leffing) (1977)
- Foreword (The Conservative: Complete, 1915-1923) (1976)
- Frank Belknap Long on the Pulps (2009)
- H. P. L. in Red Hook (1975)
- In Providence: Introduction (1988)
- Introduction (The Early Long) (1975)
- Introduction (The Hounds of Tindalos) (unknown)
- Introduction (The Return of Skull-Face) (1977)
- It's a Tough Life (1942)
- Kline vs. Burroughs: Discussions (1972) with Sam Moskowitz and Darrell C. Richardson
- Letter (Algol, Summer-Fall 1977) (1977)
- Letter (Crypt of Cthulhu, Candlemas 1983) (1983)
- Letter (Crypt of Cthulhu, Candlemas 1987) (1987)
- Letter (Crypt of Cthulhu, Hallowmas 1984) (1984)
- Letter (Crypt of Cthulhu, Roodmas 1982) (1982)
- Letter (Crypt of Cthulhu, St. John's Eve 1983) (1983)
- Letter (Crypt of Cthulhu, Yuletide 1984) (1984)
- Letter (Crypt of Cthulhu, Yuletide 1987) (1987)
- Letter (Fantasy Book, December 1983) (1983)
- Letter (Fantasy Crossroads, March 1977) (1977)
- Letter (Nyctalops #14, March 1978) (1978)
- Letter (Nyctalops #14, March 1978) [2] (1978)
- Letter (Weird Tales #2) (1980)
- Letter (Weird Tales, August 1925) (1925)
- Letter (Weird Tales, December 1928) (1928)
- Letter (Weird Tales, December 1928) (1928) with Frank Belknap Long, Jr.
- Letter (Weird Tales, February-March 1931) (1931)
- Letter (Weird Tales, February-March 1931) (1931) with Frank Belknap Long, Jr.
- Letter (Weird Tales, January 1944): Long Time (1944)
- Letter to Clark Ashton Smith, [Postmarked New York, N.Y., 18 July 1928] (2017) with H. P. Lovecraft and Donald Wandrei
- Letter to Clark Ashton Smith, [Postmarked New York, N.Y., 26 April 1929] (2017) with Gerry Butler and H. P. Lovecraft and Samuel Loveman and Vrest Orton and Wilfred Blanch Talman
- Letter to Clark Ashton Smith, [Postmarked New York, N.Y., 26 April 1929] (2017) with Gerry Butler and HPL and Frank B. Long, Jr. and Sam Loveman and Vrest Orton and Wilfred B. Talman
- Letter to Clark Ashton Smith, [Postmarked New York, N.Y., 7 September 1935] (2017) with H. P. Lovecraft and Donald Wandrei
- Letter to Clark Ashton Smith, [Postmarked Providence, R.I., 21 July 1927] (2017) with C. M. Eddy, Jr. and H. P. Lovecraft and Donald Wandrei
- Letter to Clark Ashton Smith, [Postmarked Providence, R.I., 21 July 1927] (2017) with C. M. Eddy, Jr. and Frank Belknap Long, Jr. and H. P. Lovecraft and Donald Wandrei
- Letter to Harry O. Morris, August 14, 1976 (2009)
- Letter to Harry O. Morris, June 20, 1972 (2009)
- Letter to Harry O. Morris, June 20, 1972 (2009) with Frank Long
- Letter to The SFWA Forum #32, January 1974 (1974)
- Meet the Author (1945)
- One Day in the Life of H. P. Lovecraft (1975)
- Preface to The Shunned House (1928)
- Preface to The Shunned House (1928) with Frank Belknap Long, Jr.
- Recollections of Weird Tales (1977)
- Some Random Memories of H.P.L. (1944)
- The Botanical Detective/Wobblies in the Moon (afterword) (1943)
- The Contributions of August Derleth to the Supernatural Horror Story (1995)
- The Long View (1968)
- The Long View ... (1968)
- The Migration of Birds (1922)
- The New and the Old (1954)
- The Poetry of Clark Ashton Smith (1972)
- The Story Behind the Cover (Fantastic Universe, November 1954) (1954)
- The Story Behind the Cover ... (Fantastic Universe December 1954) (1954)
- The Story Behind the Cover ... (Fantastic Universe October 1954) (1954)
- The Story Behind the Cover ... (Fantastic Universe, April 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, April 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, August 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, August 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, December 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, February 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, February 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, January 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, January 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, July 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, July 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, June 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, June 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, March 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, March 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, May 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, May 1956) (1956)
- The Story Behind the Cover ... (Fantastic Universe, October 1955) (1955)
- The Story Behind the Cover ... (Fantastic Universe, September 1954) (1954)
- The Story Behind the Cover ... (Fantastic Universe, September 1955) (1955)
- The Story Behind the Story: Brood of the Invisible Moon (We, The Invisible) (1938)
- The Story Behind the Story: Brood of the Invisible Moon (We, The Invisible) (1938) with Frank Belknap Long, Jr.
- The Story Behind the Story: Invaders from the Outer Suns (1937)
- The Story Behind the Story: Invaders from the Outer Suns (1937) with Frank Belknap Long, Jr.
- The Story Behind the Story: Plants Must Grow (1941)
- The Story Behind the Story: Red Moon (1940)
- The Story Behind the Story: Red Moon (1940) with Frank Belknap Long, Jr.
- The Story Behind the Story: Snapdragon (1941)
- The Story Behind the Story: The Ether Robots (1942)
- The Story Behind the Story: Two Against Neptune (1941)
- The Story Behind the Story: White Barrier (1939)
- Two Views of the Future (1949)
- untitled (The Faces of Science Fiction) (1984)
- Why I Selected- The House of Rising Winds (1949)
- H. P. Lovecraft (1989) by Peter Cannon (co-reviewed with Donald R. Burleson and S. T. Joshi and David E. Schultz)
- Lords of Creation (1949) by Eando Binder
- The Humanoids (1949) by Jack Williamson
- An Interview with Frank Belknap Long (1972) by Stuart David Schiff
- An Interview with Frank Belknap Long (1976) by Darrell Schweitzer
- Frank Belknap Long on Literature, Lovecraft, and the Golden Age of Weird Tales (1982) by Thomas W. Collins, Sr.
- Interview: Frank Belknap Long, The Dark Fantastic (1980) by Jeffrey M. Elliot
- On the Rim of the Unknown: A Visit with Frank and Lyda Belknap Long (1992) by Leigh Blackmore
Non-Genre Titles
Novels
- The Horror Expert (1961)
- The Horror Expert (1961) with Frank Long