| Name | Map Tool Token Link | Family | Type | Size | CR |
|---|---|---|---|---|---|
| Ochre Jelly | |
Ochre Jelly | Ooze | Large | 5 |
| Giant Octopus | RPTok | Octopus | Animal | Large | 8 |
| Octopus | RPTok | Octopus | Animal | Small | 1 |
| Ogre | |
Ogre | Humanoid | Large | 3 |
| Ogre Mage | |
Oni | Outsider | Large | 8 |
| Orc | RPTok | Orc | Humanoid | Medium | 1/3 |
| Otyugh | |
Otyugh | Aberration | Large | 4 |
| Owlbear | |
Owlbear | Magical beast | Large | 4 |