| Name | Source | Type | | Wadi | Star Trek |
| Waldahudin | Robert J. Sawyer's Starplex |
| Wanderers | Noon Universe |
| Wang's Carpets | Greg Egan's Diaspora |
| Wankh | Jack Vance's Planet of Adventure series | Black frog-like humanoids |
| The Watcher | Marvel Comics |
| Waterseekers | Red Planet |
| Weeping Angels | Doctor Who | Statue-like humanoid |
| Weevils | Torchwood | Humanoid |
| Whrloo | Larry Niven's Known Space |
| Willis the Bouncer | Red Planet |
| Winathians | DC Comics' Legion of Super-Heroes |
| Wirrn | Doctor Who |
| Wisps | Sonic the Hedgehog | Squid-like creatures of various shapes and colors |
| Wogneer | Star Trek |
| Wolfweeds | Doctor Who |
| Wookiees | Star Wars | Humanoid |
| Wraith | Stargate | The wraith looks like a human; the difference is the grey skin, the long hair of all of them, and some little holes in the face. |
| W'rkncacnter | Marathon Trilogy |