| Orthon | 10 | Fiend (devil) | Large | 17 | 105 | | lawful evil | | Mordenkainen's Tome of Foes | | | | | | |
| Otyugh | 5 | Aberration | Large | 14 | 114 | | neutral | | Monster Manual (SRD) | 16 | 11 | 19 | 6 | 13 | 6 |
| Owl | 0 | Beast | Tiny | 11 | 1 | fly | unaligned | | Monster Manual (SRD) | 3 | 13 | 8 | 2 | 12 | 7 |
| Owlbear | 3 | Monstrosity | Large | 13 | 59 | | unaligned | | Monster Manual (SRD) | 20 | 12 | 17 | 3 | 12 | 7 |
| Panther | 0.25 | Beast | Medium | 12 | 13 | | unaligned | | Monster Manual (SRD) | 14 | 15 | 10 | 3 | 14 | 7 |
| Pegasus | 2 | Celestial | Large | 12 | 59 | fly | chaotic good | | Monster Manual (SRD) | 18 | 15 | 16 | 10 | 15 | 13 |
| Pentadrone | 2 | Construct | Large | 16 | 32 | | lawful neutral | | Monster Manual | | | | | | |
| Peryton | 2 | Monstrosity | Medium | 13 | 33 | fly | chaotic evil | | Monster Manual (BR) | 16 | 12 | 13 | 9 | 12 | 10 |
| Phase spider | 3 | Monstrosity | Large | 13 | 32 | | unaligned | | Monster Manual (SRD) | 15 | 15 | 12 | 6 | 10 | 6 |
| Phoenix | 16 | Elemental | Gargantuan | 18 | 175 | fly | neutral | | Mordenkainen's Tome of Foes | | | | | | |
| Piercer | 0.5 | Monstrosity | Medium | 15 | 22 | | unaligned | | Monster Manual (BR) | 10 | 13 | 16 | 1 | 7 | 3 |
| Pit fiend | 20 | Fiend (devil) | Large | 19 | 300 | fly | lawful evil | | Monster Manual (SRD) | 26 | 14 | 24 | 22 | 18 | 24 |
| Pixie | 0.25 | Fey | Tiny | 15 | 1 | fly | neutral good | | Monster Manual | | | | | | |
| Planetar | 16 | Celestial | Large | 19 | 200 | fly | lawful good | | Monster Manual (SRD) | 24 | 20 | 24 | 19 | 22 | 25 |
| Plesiosaurus | 2 | Beast | Large | 13 | 68 | swim | unaligned | | Monster Manual (SRD) | 18 | 15 | 16 | 2 | 12 | 5 |
| Poisonous snake | 0.12 | Beast | Tiny | 13 | 2 | swim | unaligned | | Monster Manual (SRD) | 2 | 16 | 11 | 1 | 10 | 3 |
| Polar bear | 2 | Beast | Large | 12 | 42 | swim | unaligned | | Monster Manual (SRD) | 20 | 10 | 16 | 2 | 13 | 7 |
| Pony | 0.12 | Beast | Medium | 10 | 11 | | unaligned | | Monster Manual (SRD) | 15 | 10 | 13 | 2 | 11 | 7 |
| Priest | 2 | Humanoid (any race) | Medium | 13 | 27 | | any alignment | | Monster Manual (SRD) | 10 | 10 | 12 | 13 | 16 | 13 |
| Pseudodragon | 0.25 | Dragon | Tiny | 13 | 7 | fly | neutral good | | Monster Manual (SRD) | 6 | 15 | 13 | 10 | 12 | 10 |
| Pterafolk | 1 | Monstrosity | Large | 12 | 26 | fly | neutral evil | | Adventures (Tomb of Annihilation) | | | | | | |
| Pteranodon | 0.25 | Beast | Medium | 13 | 13 | fly | unaligned | | Monster Manual (SRD) | 12 | 15 | 10 | 2 | 9 | 5 |
| Purple worm | 15 | Monstrosity | Gargantuan | 18 | 247 | | unaligned | | Monster Manual (SRD) | 28 | 7 | 22 | 1 | 8 | 4 |
| Purple wormling | 2 | Monstrosity | Large | 12 | 42 | | unaligned | | Adventures (Storm King's Thunder) | | | | | | |
| Quadrone | 1 | Construct | Medium | 16 | 22 | fly | lawful neutral | | Monster Manual | | | | | | |