- Author: Sidney Denham Author Record # 19459
- Legal Name: Denham, Thomas Sidney
- Birthplace: Chester, Chesire, England, UK
- Birthdate: 1906
- Deathdate: 13 April 1968
- Language: English
- Webpages: Blogspot, sf-encyclopedia.com
- Used These Alternate Names: Justin Atholl, Sydney Denham
- Note: Baptized at Christ Church, Chester, on 15 April 1906. Birthdate listed by SFE3 is the baptismal date.
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Chapbooks
- Land of Hidden Death (1944)
- Land of Hidden Death (1944) with Justin Atholl
- The Grey Beast (1944)
- The Grey Beast (1944) with Justin Atholl
- The Man Who Tilted the Earth (1943)
- The Man Who Tilted the Earth (1943) with Justin Atholl
- The Oasis of Sleep (1944)
- The Oasis of Sleep (1944) with Justin Atholl
- Absolute Zero (1943)
- Judge and Jury (1944)
- Land of Hidden Death (1944)
- Land of Hidden Death (1944) with Justin Atholl
- Silver Lady (1944)
- Silver Lady (1944) with Justin Atholl
- The Bandaged Spectre (1944)
- The Bandaged Spectre (1944) with Justin Atholl
- The Devil His Due (1943)
- The Disappearance of Mr. Heavyside (1943)
- The Fifth Murder (1944)
- The Grey Beast (1944)
- The Grey Beast (1944) with Justin Atholl
- The Man Who Tilted the Earth (1943)
- The Man Who Tilted the Earth (1943) with Justin Atholl
- The Oasis of Sleep (1944)
- The Oasis of Sleep (1944) with Justin Atholl
- The Prison of Sunset (1937)
- The Silver Lady (1936)
- Venom (1943)
- What Flynn Saw (1943)
- What Flynn Saw (1943) with Sydney Denham