O
SRD 5.2.1 monsters listed under the letter O.
- Ochre Jelly — CR 2 · Large · Ooze
- Octopus — CR 0 · Small · Beast
- Ogre — CR 2 · Large · Giant
- Ogre Zombie — CR 2 · Large · Undead
- Oni — CR 7 · Large · Fiend
- Otyugh — CR 5 · Large · Aberration
- Owl — CR 0 · Tiny · Beast
- Owlbear — CR 3 · Large · Monstrosity