List of fictional alien species: O
| Name | Source | Type |
|---|---|---|
| Oans | DC Comics | Humanoid |
| Oannes | Babylonian mythology | Humanoid |
| Oankali | Octavia Butler's Xenogenesis series | |
| Ob'enn | Schlock Mercenary | |
| Ocampa | Star Trek | Humanoid |
| Oculons | Ascendancy | Humanoid |
| Ogri | Doctor Who | |
| Ogrons | Doctor Who | Humanoid |
| Old Ones | Warhammer 40,000 | |
| Omicronians / Popplers | Futurama | |
| Ood | Doctor Who | Squid-like Humanoid |
| Optera | Doctor Who | |
| Orandoans | DC Comics' Legion of Super-Heroes | |
| Orfa | Ascendancy | |
| Organians | Star Trek | Energy beings dedicated to stopping all forms of violence. |
| Ori | Stargate SG-1 | Humanoid, Ascended to a higher plain of existence in non-corporial form |
| Orion | Star Trek | Green-skinned humanoids known for the illegal trade their extremely attractive females as slaves. |
| Orion Rogues | Battlelords of the 23rd Century | |
| Orions | Master of Orion | |
| Orkans | Mork and Mindy | |
| Orks | Warhammer 40,000 | Humanoid |
| Orsians | Tracker | |
| Ortheans | Mary Gentle's Golden Witchbreed | Humanoid |
| Ortog | Star Control | |
| Orz | Star Control | |
| Oscar | Tommy and Oscar | Fun and weird pink alien. |
| Osirians | L. Sprague de Camp's Viagens Interplanetarias Series | Telepathic saurians. |
| Outsiders | Larry Niven's Known Space | |
| Overlords | Childhood's End by Arthur C. Clarke | Creatures with the appearance of demons that help shape the evolutionary patterns of other races. |
| Owa | Star Control 3 |
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