Theta
Astronomical nomenclature
 Delta Theta III, a planet
 Delta Theta III aborigine
 Delta Theta III aborigines
 Delta Theta III entity
 Omicron Theta star system
 Omicron Theta, a planet
 Omicron Theta colony / Omicron Theta outpost
 Theta III, a planet
 Theta VII, a planet
 Theta VII colony, a colony 
 Theta 116 solar system, a star system
 Theta VIII, a planet
 Theta Amano Trade Center
 Theta Bowles, a star
 Theta Curry, a star
 Theta Cygni XII, a planet
 Theta Gentle, a location
 Theta Gluckstern III, a planet
 Theta Helios, a planet
 Theta Hulett, a location
 Theta Hydrae, a star system in the Beta Quadrant
 Theta Mees, a location
 Theta Omicron IV, a planet
 Theta Zeta, a planetoid
 Theta Zibal III, a planet

Codes
 "La Forge-theta-2-9-9-7", used to override operational safety limits and to verify priority clearance
 Theta-3, a decryption protocol on a Borg ship
 "Theta-alpha-2-7-3-7-blue", used by Riker to access Data's schematics
 "Worf theta-6-1-9", used to override holodeck lockout

Designations
 Theta (classification), a Terran slave classification for the Alliance in the mirror universe
 "0413 Theta", a slave designation

File names
 Kim Sports Program Theta-2, a holodeck program
 "Theta-12-alpha", computer medical file 
 "Theta-15", filename where The Doctor's original holodeck program was stored

Locations
 "6-theta-9", a location on the USS Voyagers deck 4
 "87-theta/271", spatial coordinates of Voyagers location
 "Grid 124, Octant 22-theta", Borg designation for origin of Species 6339
 "Theta-1-6", a section location on a planet

Science and technology
 "Omicron theta", a sensor band
 "T = C1/θ(P)E", a math equation
 "Theta 309", a subspace band
 Theta-band / theta-band radiation / theta radiation / theta radiation field
 Theta-band device, a device used to generate theta-bands
 Theta core
 Theta storage tank / theta tank, used to house theta radiation
 Theta radiation poisoning
 Theta band filter, used on a Fournier scan
 Theta band frequency, a subspace communications frequency
 Theta class (planetoid), a type of planetoid
 Theta class (starship), a type of raider
 Theta-matrix compositor, assists in recrystalizing dilithium
 Theta flux distortion
 Theta wave, type of brain waves
 Theta-xenon, a chemical element

Tactics
 "Pattern theta", attack pattern used by Benjamin Sisko aboard a runabout to destroy the wormhole in a Dominion simulation; also ordered by Sisko for Federation fighters against the Dominion
 "Pattern Shinzon theta", Shinzon's signature attack pattern
 "Pattern theta", an evasive maneuver against the Cardassians
 "Pattern theta-1", used by Tom Paris to evade the Praylor
 "Pattern theta-2", used by Chakotay to evade the Kazon
 Theta formation, ordered by Sisko for Federation fighters

fr:Thêta