Novels[]
Necroscope[]
- 1986 – Necroscope
- 1988 – Necroscope II: Vamphyri!
- 1989 – Necroscope III: The Source
- 1990 – Necroscope IV: Deadspeak
- 1991 – Necroscope V: Deadspawn
- 1992 – Vampire World I: Blood Brothers
- 1993 – Vampire World II: The Last Aerie
- 1994 – Vampire World III: Bloodwars
- 1995 – Necroscope: The Lost Years: Volume I
- 1996 – Necroscope: The Lost Years II: Resurgence
- 1999 – Necroscope: Invaders also titled "E-Branch: Invaders"
- 2000 – Necroscope: Defilers
- 2001 – Necroscope: Avengers
- 2006 – Necroscope: The Touch
- 2010 – Necroscope: The Plague-Bearer
- 2013 – Necroscope: The Mobius Murders
Titus Crow[]
- 1974 – The Burrowers Beneath
- 1975 – The Transition of Titus Crow
- 1978 – The Clock of Dreams
- 1978 – Spawn of the Winds
- 1979 – In the Moons of Borea
- 1989 – Elysia: The Coming of Cthulhu
Novellas[]
- 2009 – For the Dead Travel Slowly
- 2009 – Harry and the Pirates
Collections[]
- 2003 – Harry Keogh: Necroscope and Other Weird Heroes!
- 2009 – Necroscope: The Lost Years: Harry and the Pirates
Novelettes[]
- 1969 – Cement Surroundings
- 1976 – The Fairground Horror
- 1980 – The Second Wish
Short Stories[]
- 1969 – The Sister City
- 2003 – Dead Eddy
- 2003 – Dinosaur Dreams
- 2003 – Resurrection
- 2009 – Old Man with a Blade
Poetry[]
- 1971 – Enough
- 1971 – In Pressure-Pounded Chasms
- 1976 – Visions from Aeons . . . Dead?
- 1977 – A Cry at Night
- 1977 – Escape!
- 1977 – Destiny
- 1977 – Fantasy Crossroads
- 1977 – The Skull of H P L
- 1977 – City Out of Time
- 1978 – Tindalos
- 1978 – Weirdbook
- 1978 – Fantasy Tales
- 1980 – The Wind-Walker
- 1980 – Kadath
- 1981 – Swamp Call
- 1982 – Witching Hour
- 1982 – Warhorse
- 1984 – Sea Fret
- 1984 – Mammoth Rider
- 1986 – Dream
- 1987 – Inmate
- 1987 – Kraken
- 1987 – Y'ha-Nlthlei
- 1998 – Mirrors at Midnight
- 1998 – Amber Man