Novels
- Time Was: Isaac Asimov’s I-Bots (co-written with Steve Perry, 1998)
- The Indifference of Heaven (2000)
- Dark Matter #1: In Hollow Houses (2000)
- This Flesh Unknown (2001)
- In Silent Graves (Leisure edition 2004; Journalstone author’s preferred edition 2015)
- In the Midnight Museum (2005)
- Keepers (Leisure edition 2005; Journalstone author’s preferred edition)
- Prodigal Blues (2006)
- Mr. Hands (Leisure edition 2007; Journalstone author’s preferred edition)
- Coffin County (2008, Leisure)
- Far Dark Fields (2009)
Novellas
- Tesselations (Trick or Treat, Cemetery Dance, 2001)
- One Brown Mouse (2003)
- At Eternity’s Gate (2003)
- Palimpsest Day (2003)
- We Now Pause for Station Identification (2005)
- Kiss of the Mudman (2006)
- This is Not My Movie (24 Frames Per Second, Crystal Lake Publishing, 2025)
Collections
- Things Left Behind (1997)
- Escaping Purgatory (2001)
- Sorties, Cathexes, and Personal Effects (2002)
- Graveyard People: The Collected Cedar Hill Stories, Volume 1 (2003)
- X3 (2003)
- A Little Orange Book of Odd Stories (2003)
- From Beneath these Fields of Blood (2004)
- Home Before Dark: The Collected Cedar Hill Stories, Volume 2 (2005)
- Destinations Unknown (2006)
- Smiling Faces Sometimes (2007)
- Cages and Those Who Hold the Keys (2011)
- Rose of Sharon (2013)
- Halfway Down the Stairs (2015)
- There Comes a Midnight Hour (2021)
Nonfiction
- Fear In A Handful Of Dust: Horror As A Way Of Life (2004)
- To Each Their Darkness (2010)
As Editor
- Masques V (co-edited with Jerry Williamson, 2006)
- Five Strokes to Midnight (co-edited with Hank Schwaeble, 2007)
Short Stories
Gary has written more than 200 short stories. Here’s the full list.