| Name | CR | Type | Environment |
| Deh-Nolo | 14 | aberration | any |
| Devil, Endbringer Devil (Dhalochar) | 19 | outsider (devil, evil, extraplanar, lawful) | any (Hell) |
| Draelik | 2 | humanoid (draelik) | any (Great Shadar) |
| Dragon (Chromatic), Young Adult Blue Dragon | 11 | dragon (earth) | any |
| Dragonkin | 9 | dragon | any (Triaxus) |
| Driftdead | 2 | undead (extraplanar) | any (the Drift) |
| Drow, Drow Enforcer | 1 | humanoid (elf) | any (Apostae) |
| Drow, Drow Noble Arms Dealer | 11 | humanoid (elf) | any (Apostae) |