| Tlincalli | 5 | Monstrosity | Large | 15 | 85 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Tortle | 0.25 | Humanoid (tortle) | Medium | 17 | 22 | | lawful good | | Mordenkainen's Tome of Foes | | | | | | |
| Tortle druid | 2 | Humanoid (tortle) | Medium | 17 | 33 | | lawful neutral | | Mordenkainen's Tome of Foes | | | | | | |
| Transmuter | 5 | Humanoid (any race) | Medium | 12 | 40 | | any alignment | | Volo's Guide to Monsters | | | | | | |
| Trapper | 3 | Monstrosity | Large | 13 | 85 | | unaligned | | Volo's Guide to Monsters | | | | | | |
| Treant | 9 | Plant | Huge | 16 | 138 | | chaotic good | | Monster Manual (SRD) | 23 | 8 | 21 | 12 | 16 | 12 |
| Tri flower frond | 0.5 | Plant | Medium | 10 | 11 | | unaligned | | Adventures (Tomb of Annihilation) | | | | | | |
| Tribal warrior | 0.12 | Humanoid (any race) | Medium | 12 | 11 | | any alignment | | Monster Manual (SRD) | 13 | 11 | 12 | 8 | 11 | 8 |
| Triceratops | 5 | Beast | Huge | 13 | 95 | | unaligned | | Monster Manual (SRD) | 22 | 9 | 17 | 2 | 11 | 5 |
| Tridrone | 0.5 | Construct | Medium | 15 | 16 | | lawful neutral | | Monster Manual | | | | | | |
| Troglodyte | 0.25 | Humanoid (troglodyte) | Medium | 11 | 13 | | chaotic evil | | Monster Manual (BR) | 14 | 10 | 14 | 6 | 10 | 6 |
| Troll | 5 | Giant | Large | 15 | 84 | | chaotic evil | | Monster Manual (SRD) | 18 | 13 | 20 | 7 | 9 | 7 |
| Twig blight | 0.12 | Plant | Small | 13 | 4 | | neutral evil | | Monster Manual (SRD) | 6 | 13 | 12 | 4 | 8 | 3 |
| Tyrannosaurus rex | 8 | Beast | Huge | 13 | 136 | | unaligned | | Monster Manual (SRD) | 25 | 10 | 19 | 2 | 12 | 9 |
| Ulitharid | 9 | Aberration | Large | 15 | 127 | | lawful evil | | Volo's Guide to Monsters | | | | | | |
| Ultroloth | 13 | Fiend (yugoloth) | Medium | 19 | 153 | fly | neutral evil | | Monster Manual | | | | | | |
| Umber hulk | 5 | Monstrosity | Large | 18 | 93 | | chaotic evil | | Monster Manual (BR) | 20 | 13 | 16 | 9 | 10 | 10 |
| Unicorn | 5 | Celestial | Large | 12 | 67 | | lawful good | Legendary | Monster Manual (SRD) | 18 | 14 | 15 | 11 | 17 | 16 |
| Uthgardt shaman | 2 | Humanoid (human) | Medium | 13 | 38 | | neutral evil | | Adventures (Storm King's Thunder) | | | | | | |
| Vajra safahr | 13 | Humanoid (human) | Medium | 14 | 126 | | lawful neutral | | Adventures (Dragon Heist) | | | | | | |
| Vampire | 13 | Undead (shapechanger) | Medium | 16 | 144 | | lawful evil | Legendary | Monster Manual (SRD) | 18 | 18 | 18 | 17 | 15 | 18 |
| Vampire spawn | 5 | Undead | Medium | 15 | 82 | | neutral evil | | Monster Manual (SRD) | 16 | 16 | 16 | 11 | 10 | 12 |
| Vampiric mist | 3 | Undead | Medium | 13 | 30 | fly | chaotic evil | | Mordenkainen's Tome of Foes | | | | | | |
| Vargouille | 1 | Fiend | Tiny | 12 | 13 | fly | chaotic evil | | Volo's Guide to Monsters | | | | | | |
| Vegepygmy | 0.25 | Plant | Small | 13 | 9 | | neutral | | Volo's Guide to Monsters | | | | | | |