| Abbreviation | Definition |
|---|---|
| OFM | Order Of Friar Madbear |
| OJK | Order of the Jedi Knights |
| OK | Old Kingdom |
| OL | Obsidion Legionnares |
| OMC | Oblivion Message Central |
| OO | Octopus Overlords |
| OOAA | Order of Arcane Arts |
| OOB | Out Of Body |
| OOBE | Out Of Body Experience |
| OOD | Outcasts Of Doom |
| OOE | Order Of Eternity |
| OOK | Out Of Kontrol |
| OOP | Organization Of Planets |
| OOTD | Out Of The Darkness |
| OoTP | Order of the Phoenix |
| OOTS | Order Of The Stick |
| OQC | Orbital Quarantine Command |
| OQP | Orbital Qualifications Program |
| ORG | Original Robot Girl |
| ORION | Our Race Is Our Nation |