"The Dark Horse Book of" is a series of four horror anthologies published annually between 2003 and 2006. The volumes each contain original stories not previously published. So far, volumes have only been released as hardcovers.
- The Dark Horse Book of Hauntings contains "Dr. Carp's Experiment" (Aug 2003)
- The Dark Horse Book of Witchcraft contains "The Troll-Witch" (Jun 2004)
- The Dark Horse Book of The Dead contains "The Ghoul" (Jun 2005)
- The Dark Horse Book of Monsters contains "The Hydra and the Lion" (Nov 2006)
All four of these Hellboy stories were collected in Hellboy: vol. 7 The Troll Witch and Others, published in October 2007.