- Author: Robert W. Sneddon Author Record # 19179
- Legal Name: Sneddon, Robert William
- Birthplace: Beith, Scotland, UK
- Birthdate: 1880
- Deathdate: 1944
- Language: English
- Used These Alternate Names: Mark Shadow, Robert Sneddon
- Author Tags: occult (1), weird (1)
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Short Fiction
- Half Past Twelve in Eternity (1924)
- In Terror of Laughing Clay (1926)
- Magic in Manhattan (1919)
- NEXT!—Within Four Creeping Walls (1925)
- On the Isle of Blue Men (1927)
- On the Isle of Blue Men (1993)
- Painted Upside Down (1928)
- The Conqueror (1919)
- The Nameless Thing (1919)
- The Tell-Tale Mark (1930)
- The Thing in the Theater (1929)
- The Vampire of Oakdale Ridge (1926)
- Fourplay (1992)
- Letter (Ansible 163) (2001)
- Strange Tales and True (1932)
- The Mystery of the Dancing Coffins (1929)