List of fictional alien species: O

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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