Credits marked with an asterisk only appear on the box of the 1996 re-release “Heretic: Shadow of the Serpent Riders”, but not on the original 1994 release box.
| Brian Raffel | Project Director |
| John Romero | Executive Producer |
| Brian Raffel | Artist |
| Steve Raffel | Artist |
| Brian Pelletier | Artist |
| Shane Gurno | Artist |
| Jim Sunwalt | Artist |
| Scott Rice | Artist |
| Ben Gokey | Programmer |
| Chris Rhinehart | Programmer |
| Michael Raymond-Judy | Level Design |
| Eric C. Biessman* | Level Design |
| Tim Moore* | Level Design |
| Kevin Schilder | Sound & Music |
| Paul Radek | Sound Drivers |
| John Carmack | 3D Engine |