| Name | CR | Type | Environment |
| Nanobot Mimic | 3 | construct (swarm, technological) | any |
| Necrosaturated Stag-Bear | 2 | magical beast | any (Weydana-4) |
| Necrovite | 13 | undead | any (Eox) |
| Needlehawk | 3 | animal | warm and temperate forests |
| Neotophet | 10 | construct (magical, technological) | any |
| Niaq | 6 | magical beast | any cold (Verces) |
| Night Hag | 9 | outsider (evil, extraplanar) | any evil-aligned plane |
| Nihili | 5 | undead | any vacuum |
| Nihili, Nihili Captain | 13 | undead | any vacuum |
| Nuar, Nuar Enforcer | 4 | monstrous humanoid | any (Absalom Station) |
| Nuar, Nuar Specialist | 8 | monstrous humanoid | any (Absalom Station) |
| Nullsoul Host | 13 | construct (android, magical, technological) | any |
| Nyssholora, Adult Nyssholora | 11 | magical beast | temperate or warm plains (Castrovel) |
| Nyssholora, Juvenile Nyssholora | 4 | magical beast | temperate or warm plains (Castrovel) |