| Name |
Source |
Type
|
| Oans |
DC Comics |
An ancient humanoid species and the founders of the Green Lantern Corps.
|
| Oannes |
Babylonian mythology |
Humanoid
|
| Oankali |
Octavia Butler's Xenogenesis series |
|
| Oasian |
Roswell New Mexico |
|
| Ob'enn |
Schlock Mercenary |
|
| Ocampa |
Star Trek |
Humanoid
|
| Oculons |
Ascendancy |
Humanoid
|
| Ogri |
Doctor Who |
|
| Ogrons |
Doctor Who |
Humanoid
|
| Old Ones |
Warhammer 40,000 |
|
| Olive |
Adventure Time: Distant Lands |
Shape-shifting service droid
|
| Omicronians / Popplers |
Futurama |
|
| Ood |
Doctor Who |
Squid-like Humanoid
|
| Optera |
Doctor Who |
|
| Orandoans |
DC Comics' Legion of Super-Heroes |
A humanoid species from the planet Orando. Legion member Princess Projectra is an Orandoan.
|
| Orfa |
Ascendancy |
|
| Organians |
Star Trek |
Energy beings dedicated to stopping all forms of violence.
|
| Orgalorg
|
Adventure Time
|
A malevolent primordial space deity who takes the form of the penguin Gunter. He is from an unnamed slimy planet.
|
| 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 |
|
| Orishan |
Ben 10 |
A race of mollusk-like humanoids from the desert planet Kiusana in the Andromeda Galaxy. They can absorb and redirect moisture.
|
| 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.
|
| Oscillator |
Adventure Time: Fionna and Cake |
|
| 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 |
|