| Author | Title | Type | Collection |
| Michael O'Donoghue | "The Psycho" | short story | Dark Love |
| Marie O'Regan | editor | Hellbound Hearts | |
| Monica J. O'Rourke | Suffer the Flesh | novel | |
| Joyce Carol Oates | "Situations, The" | short story | Dark Screams: Volume 6 |
| Weston Ochse | Burning Sky | novel | |
| Howard Odentz | Snow | short story | |
| Mike Oliveri | Pack, The: Winter Kill | novel | |
| Mike Oliveri | Restore From Backup | novella | |
| Mark Onspaugh | editor | Forsaken,The : Stories of Abandoned Places | |
| Kelli Owen | Neighborhood, The | novel | |
| Kelli Owen | Six Days | novel | |
| Kelli Owen | "Waiting Out Winter" | novella | Midnight Symphony (10 Novellas of Horror & Suspense) |
