| Galeb duhr | 6 | Elemental | Medium | 16 | 85 | | neutral | | Monster Manual (BR) | 20 | 14 | 20 | 11 | 12 | 11 |
| Frost salamander | 9 | Elemental | Huge | 17 | 168 | | unaligned | | Mordenkainen's Tome of Foes | | | | | | |
| Frost giant everlasting one | 12 | Giant (frost giant) | Huge | 15 | 189 | | chaotic evil | | Volo's Guide to Monsters | | | | | | |
| Frost giant | 8 | Giant | Huge | 15 | 138 | | neutral evil | | Monster Manual (SRD) | 23 | 9 | 21 | 9 | 10 | 12 |
| Froghemoth | 10 | Monstrosity | Huge | 14 | 184 | swim | unaligned | | Volo's Guide to Monsters | 23 | 13 | 20 | 2 | 12 | 5 |
| Frog | 0 | Beast | Tiny | 11 | 1 | swim | unaligned | | Monster Manual (SRD) | 1 | 13 | 8 | 1 | 8 | 3 |
| Fraz urb luu | 23 | Fiend (demon) | Large | 18 | 337 | fly | chaotic evil | | Mordenkainen's Tome of Foes | | | | | | |
| Fomorian | 8 | Giant | Huge | 14 | 149 | | chaotic evil | | Monster Manual | | | | | | |
| Flying sword | 0.25 | Construct | Small | 17 | 17 | fly | unaligned | | Monster Manual (SRD) | 12 | 15 | 11 | 1 | 5 | 1 |
| Flying snake | 0.12 | Beast | Tiny | 14 | 5 | fly, swim | unaligned | | Monster Manual (SRD) | 4 | 18 | 11 | 2 | 12 | 5 |
| Flumph | 0.12 | Aberration | Small | 12 | 7 | fly | lawful good | | Monster Manual | | | | | | |
| Flind | 9 | Humanoid (gnoll) | Medium | 16 | 127 | | chaotic evil | | Volo's Guide to Monsters | 20 | 10 | 19 | 11 | 13 | 12 |
| Flesh golem | 5 | Construct | Medium | 9 | 93 | | neutral | | Monster Manual (SRD) | 19 | 9 | 18 | 6 | 10 | 5 |
| Flameskull | 4 | Undead | Tiny | 13 | 40 | fly | neutral evil | | Monster Manual (SRD) | 1 | 17 | 14 | 16 | 10 | 11 |
| Flail snail | 3 | Elemental | Large | 16 | 52 | | unaligned | | Volo's Guide to Monsters | | | | | | |
| Fist of bane | 0.5 | Humanoid (human) | Medium | 18 | 22 | | lawful evil | | Adventures (Descent into Avernus) | | | | | | |
| Firenewt warrior | 0.5 | Humanoid (firenewt) | Medium | 16 | 22 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Firenewt warlock of imix | 1 | Humanoid (firenewt) | Medium | 10 | 33 | | neutral evil | | Volo's Guide to Monsters | | | | | | |
| Fire snake | 1 | Elemental | Medium | 14 | 22 | | neutral evil | | Monster Manual (BR) | 12 | 14 | 11 | 7 | 10 | 8 |
| Fire giant dreadnought | 14 | Giant (fire giant) | Huge | 21 | 187 | | lawful evil | | Volo's Guide to Monsters | | | | | | |
| Fire giant | 9 | Giant | Huge | 18 | 162 | | lawful evil | | Monster Manual (SRD) | 25 | 9 | 23 | 10 | 14 | 13 |
| Fire elemental myrmidon | 7 | Elemental | Medium | 18 | 123 | | neutral | | Mordenkainen's Tome of Foes | | | | | | |
| Fire elemental | 5 | Elemental | Large | 13 | 102 | | neutral | | Monster Manual (SRD) | 10 | 17 | 16 | 6 | 10 | 7 |
| Female steeder | 1 | Monstrosity | Large | 14 | 30 | | unaligned | | Mordenkainen's Tome of Foes | | | | | | |
| Faerie dragon | 1 | Dragon | Tiny | 15 | 14 | fly | chaotic good | | Monster Manual | | | | | | |