| Name | CR | Type | Environment |
| Warpstitcher | 14 | aberration | any land |
| Weaponized Toy, Weaponized Devil-in-a-box | 3 | construct (technological) | any |
| Weaponized Toy, Weaponized Gamedroid | 6 | construct (magical, technological) | any |
| Wellspring Wisp | 5 | outsider (air, elemental, fire, native) | any wellspring (Genrovis) |
| Wetzelt | 4 | aberration (reptoid) | any |
| Witchwyrd | 6 | monstrous humanoid | any |
| Woioko | 4 | humanoid (woioko) | any oceans (Heicoron IV) |
| Wolliped, Alural War Wolliped | 9 | animal | cold hills, mountains, or plains (Triaxus) |
| Wolliped | 3 | animal | cold hills, mountains, or plains (Triaxus) |
| Worieg | 6 | fey (shapeshifter) | any |
| Worlanisi, Fortunaut | 9 | humanoid (worlanisi) | any (Worlan) |
| Worlanisi | 1 | humanoid (worlanisi) | any (Worlan) |
| Wrikreechee | 3 | monstrous humanoid (aquatic) | any aquatic or urban (Akchios) |
| Writher Swarm | 9 | plant (swarm) | any temperate or warm lands |
| Wysp | 2 | outsider (elemental, extraplanar) | any (Elemental Planes) |
| Wysp, Wysp Conductor | 8 | outsider (elemental, extraplanar) | any (Elemental Planes) |