Omicron

;Astronomical nomenclature
* Alpha Omicron system
** Alpha Omicron asteroid belt
** Alpha Omicron VII, a planet
* Omicron Ceti, a star
* Omicron Ceti III (aka Omicron III), a planet
** Omicron colony
*** Omicron Ceti III inhabitants
* Omicron Delta region
* Omicron Gruis, a star system
* Omicron Leonis, a star
* Omicron Pascal, a location
* Omicron Seti III, a planet
* Omicron Theta star system
** Omicron Theta, a planet
*** Omicron Theta colony (aka Omicron Theta outpost)
**** Omicron Theta colony inhabitants
* Omicron system
** Omicron IV, a planet
* Theta Omicron IV, a planet
* Vega-Omicron sector
;Chemistry
* Omicron band
* Omicron particle / omicron radiation
;Starfleet terminology
* "Omicron-omicron-alpha-yellow-daystar 2-7", a Starfleet command authorization code in 2365
* "Omicron theta", a subspace sensor band
;Retconned references
* Omicron Alpha
* Omicron Beta
fr:Omicron