|Ocampa||Humanoid civilization from Delta Quadrant who have a life span of nine years||"Caretaker", "Cold Fire", Emanations" (VGR)|
|Old Ones||Long-dead civilization on planet Exo III||"What Are Little Girls Made Of" (TOS)|
|Old Ones||Leaders of Korob and Sylvia's homeworld||"Catspaw" (TOS|
|omnicordial life-form||Type of being that dwelled in Galactic Cluster 3, Species 259 was an pmnicordal life-form||"The Gift" (VGR)|
|Onaya||Noncorporeal life-form who lived on neural energy from the act of creativity in humanoid minds||"The Muse" (DS9)|
|ophidian||Snake-like animal used by Devidians||"Time's Arrow, Parts I & II" (TNG)|
|Organians||Powerful noncorporeal beings responsible for peace treaty between the Klingons and the Federation||"Errand Of Mercy" (TOS)|
|Orillian lung maggot||Form of life indigenous to Orillian homeworld||"Fair Trade" (VGR)|
|Orion wing-slug||Lower life-form||"Menage a Troi" (TNG)|
|Orions||Characteristically green-skinned humanoids: females of the species were once sold as commodities||"The Cage",
"The Menagerie, Part II"
"Whom Gods Destroy" (TOS)
|Ornarans||Humanoid species native to planet Ornara; the entire civilization was addicted to the drug felicium||"Symbiosis" (TNG)`|
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