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Factions are interstellar states or associations; often composed or dominated by a single race but sometimes consisting of thousands. Playable factions (such as Starfleet and the Klingon Defense Force), are used by the player to create characters whereas most factions are only encountered by the player.

Note that a faction in gameplay terms may be slightly different in narrative terms (Starfleet is a playable faction in terms of gameplay, but is the defense arm of the Federation faction in narrative terms). Others factions are narratively part of a larger faction (i.e. Vulcan).

Faction Playable Species Capital world NPCs Memory Alpha
Faction Benthan Benthan Guard No Benthan Benthos NPCs, Starships Benthan
Faction Borg Borg Collective No Borg Unicomplex NPCs, Starships
Ground forces
Borg Collective
Faction Breen Breen Confederacy No Breen Breen (planet) NPCs, Starships
Ground forces
Breen Confederacy
Faction Cardassian Cardassian Union No Cardassian Cardassia NPCs, Starships
Ground forces
Cardassian Union
Faction Cooperative The Cooperative No Liberated Borg NPCs, Starships Cooperative
Faction Cravic Cravic No Automated Personnel Unit NPCs, Starships Automated Personnel Unit
Faction Deferi Deferi No Deferi Defera NPCs, Starships
Ground forces
Faction Devidian Devidian No Devidian Devidia II NPCs, Ground forces Devidian
Faction Dominion Dominion Yes Changeling, Jem'Hadar,
Vorta, others
Empersa NPCs, Starships
Ground forces
Faction DSC DSC Starfleet Yes Human, Vulcan Earth Starships
Faction Elachi Elachi No Elachi Subspace NPCs, Starships
Ground forces
Faction Fek'Ihri Fek'Ihri Horde No Fek'Ihri Gre'thor NPCs, Starships
Ground forces
Faction Ferengi Ferengi Alliance No Ferengi Ferenginar NPCs, Starships
Ground forces
Ferengi Alliance
Faction Gorn Gorn Hegemony No Gorn Gornar NPCs, Starships
Ground forces
Gorn Hegemony
Faction Hazari Hazari No Hazari NPCs, Starships Hazari
Faction Hierarchy Hierarchy No Overlooker NPCs, Starships Hierarchy
Faction Hirogen Hirogen No Hirogen NPCs, Starships
Ground forces
Faction Hur'q Hur'q No Hur'q, Attendant Havas-Kul NPCs, Starships
Ground forces
Faction Iconian Iconian Whole No Iconian, Herald Iconia NPCs, Starships
Ground forces
Faction Kazon Kazon sects No Kazon NPCs, Starships Kazon
Faction Kentari Kentari Union No Kentari New Kentar NPCs
Faction Klingon Klingon Empire
(Klingon Defense Forces)
Yes Klingon Qo'noS NPCs, Starships
Ground forces
Klingon Empire
Faction Klingon Empire Rebel Klingon Empire Rebel No Klingon Qo'noS NPCs, Starships
Faction Klingon 2256 Klingon 2256 No Klingon Qo'noS NPCs, Starships
Faction Kobali Kobali No Kobali Kobali Prime NPCs, Starships
Ground forces
Faction Krenim Krenim No Krenim Kyana Prime NPCs, Starships
Ground forces
Faction Lukari Lukari Concordium No Lukari Lukar NPCs, Starships
Faction Malon Malon No Malon Malon Prime NPCs, Starships Malon
Faction Na'kuhl Na'kuhl No Na'kuhl NPCs, Starships
Ground forces
Faction Nausicaan Nausicaan No Nausicaan Nausicaa NPCs, Starships
Ground forces
Faction Ocampa Ocampa No Ocampa NPCs, Starships Ocampa
Faction Octanti Octanti No Octanti NPCs, Starships Octanti
Faction Orion Orion Syndicate No Orion Ter'jas Mor NPCs, Starships
Ground forces
Faction Pralor Pralor No Automated Personnel Unit NPCs, Starships Automated Personnel Unit
Faction Reman Reman Resistance No Reman Remus NPCs, Starships
Ground forces
Faction Romulan Republic Romulan Republic Yes Romulan, Reman New Romulus NPCs, Starships
Ground forces
Faction Romulan Star Empire Romulan Star Empire No Romulan, Reman Rator III NPCs, Starships
Ground forces
Romulan Star Empire
Faction Son'a Son'a No Son'a Ba'ku NPCs Son'a
Faction Sphere Builders Sphere Builder No Tuterian NPCs, Starships Sphere-Builder
Faction Talaxian Talaxian No Talaxian New Talax NPCs, Starships Talaxian
Faction Terran Empire Terran Empire No Terran and others Earth NPCs, Starships
Ground forces
Terran Empire
Faction Tholian Tholian Assembly No Tholian Tholia NPCs, Starships
Ground forces
Faction FED23 TOS Starfleet Yes Human, Vulcan,
Andorian, Tellarite
Earth Starships
Faction True Way True Way Alliance No Cardassian, Alpha Jem'Hadar Devos II NPCs, Starships
Ground forces
True Way
Faction Turei Turei No Turei NPCs, Starships
Ground forces
Faction Tzenkethi Tzenkethi Coalition No Tzenkethi Tzenketh NPCs, Starships
Ground forces
Faction Undine Undine No Undine Fluidic Space NPCs, Starships
Ground forces
Species 8472
Faction FED25 United Federation of Planets
Yes Human, Vulcan,
and many others
Earth NPCs, Starships
Ground forces
United Federation of Planets
Faction Vaadwaur Vaadwaur Supremacy No Vaadwaur Vaadwaur Prime NPCs, Starships Vaadwaur
Faction Vorgon Vorgon No Vorgon NPCs, Starships Vorgon
Faction Voth Voth No Voth NPCs, Starships
Ground forces
Faction Vulcan Vulcan No Vulcan Vulcan (planet) NPCs, Starships
Ground forces

v · d · e
Factions by Quadrant
α Breen ConfederacyCardassian UnionDeferiDrantzuliFederation (Starfleet) • Ferengi AllianceKentari UnionLukari ConcordiumNa'kuhlTholian AssemblyTrue Way AllianceTzenkethi Coalition
β Federation (StarfleetDSC StarfleetTOS Starfleet) • Gorn HegemonyIconianKlingon Empire (Klingon Defense Force) • Klingon Empire RebelsKlingons (2256)NausicaanOrion SyndicateRomulan RepublicRomulan Star EmpireReman ResistanceSon'aVulcan
γ DominionFek'Ihri HordeHur'q
Δ Automated Personnel UnitBenthanBorg CollectiveThe CooperativeBluegillHazariHierarchyHirogenKazonKobaliKrenimMalonOcampaOctantiTalaxianTureiTuterianVaadwaur SupremacyVoth
Others Borg KingdomCoalitionCreaturesDevidianElachiTerran EmpireUndine (Species 8472)Vorgon