Role-playing games: O
20 role-playing games
| Role-playing game | First published | Publisher | Country of origin |
|---|---|---|---|
| O.D.I.N. (Occult Dynamics Intelligence Network) | 29 August 2025 | — | Germany |
| Obsidian: The Age of Judgement | 1999 | — | — |
| OctaNe | 2002 | Memento Mori Theatricks | United States |
| Odysseus | 1980 | Fantasy Games Unlimited | United States |
| Old-School Essentials Retro Adventure Game | 2019 | — | — |
| Omnigon | 1989 | — | — |
| On Mighty Thews | 2009 | self-published work | — |
| One Roll Engine | 2002 | — | — |
| Oniros | 1994 | Multisim | France |
| OpenQuest | 2009 | — | — |
| Opera RPG | 2001 | — | Brazil |
| Orbit | 1997 | — | — |
| Ork! The Roleplaying Game | 2000 | Green Ronin Publishing | United States |
| Orkworld | 2000 | John Wick Presents | United States |
| OSRIC | 2006 | — | — |
| Other Dust | 2012 | Sine Nomine Publishing | United States |
| Other Suns | 1983 | — | — |
| Otherkind | 2002 | self-published work | — |
| Outime | 1983 | — | — |
| Over the Edge | 1992 | Atlas Games | United States |