List of fictional alien species: Y
| Name | Source | Type |
|---|---|---|
| Yacatisma | Church of the SubGenius | |
| Yag-Kosha | Robert E. Howard's The Tower of the Elephant | Humanoid elephant |
| Yanme'e | Halo | |
| Yautja | Predator | Humanoid |
| Yazirian | Star Frontiers | ape-like humanoid glider |
| Yeerks | K. A. Applegate's Animorphs | Slug-like parasitic |
| Yehat | Star Control | Pterodactyl-like |
| Yeti | Doctor Who | |
| Yilane | West of Eden series of Harry Harrison | |
| Yip-Yips | Sesame Street | |
| Yliis | 2300 AD | |
| Yoda | Star Wars | |
| Yolkians | Jimmy Neutron | |
| Yomingans | Schlock Mercenary | |
| Yor | Galactic Civilizations | |
| Yorn | Star Control 3 | |
| Yridian | Star Trek | |
| Yugopotamians | The Fairly Oddparents | Squid-like aliens with dome covered brains |
| Yuki Nagato | The Melancholy of Haruhi Suzumiya | Humanoid interface |
| Yuuzhan Vong | Star Wars | Humanoid |
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