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For the primary universe counterpart, see United Federation of Planets.
For other uses, see commonwealth.

In the mirror universe, the Galactic Commonwealth was an organization founded in the year 2378 that replaced the Terran Rebellion following the establishment of the Tripartite Armistice with the Klingon-Cardassian Alliance and the end of decades of enslavement. The Commonwealth consisted of more than two dozen worlds in a twenty light-year span from Sol and was surrounded by a ten light-year wide neutral zone that blocked Alliance vessels access to Commonwealth worlds. One of the Galactic Commonwealth's first allies was the Romulan Star Empire, which the Rebellion had also helped to return to power.

A descendant of the Terran Empire, the Commonwealth was heavily influenced by the efforts of Spock and the Memory Omega project that he instituted. The Commonwealth focused on promoting the common good for all races and strived to avoid returning to the imperialistic ways of its past. It launched multiple social programs and conducted missions to repair the damage that had been caused to multiple worlds by both the Alliance and the Empire that came before it. The Commonwealth also employed a naval force that consisted of several vessels including the Defiant and the Enterprise, with the Enterprise as the flagship.

Headquartered from the planet Deneva, the Commonwealth was headed by a chairman and overseen by the Commonwealth Assembly. It consisted of Terrans, Andorians, Tellarites, Vulcans and several other races. As of 2381 the Chairman of the Commonwealth is Michael Eddington. (ST novel: Rise Like Lions)


In the armistice, more than two dozen worlds were formally ceded to the Commonwealth in a 20 light-year zone around Sol. The entire territory was surrounded by the Terran Neutral Zone, 10 ly thick. The Commonwealth was intent on peaceful expansion by voluntary admission of worlds. Its territory shared borders with the Klingon Empire, Cardassian Union, Romulan Star Empire and the Taurus Pact.

Planets and systems

List of starships of the Galactic Commonwealth


States in the mirror universe
treaty of alliance and mutual defense Galactic CommonwealthRomulan Star Empire
Taurus Pact Breen ConfederacyGorn HegemonyTholian AssemblyTzenkethi Coalition
non-aligned states Borg CollectiveCardassian UnionDominionFerengi AllianceGrigariKazon-OglaKinshayaKlingon EmpireTalarian RepublicThallonian Empire
defunct states Klingon-Cardassian AllianceTerran EmpireTerran RepublicTerran RebellionTerran Protectorate
major states in the Alpha and Beta Quadrants
Khitomer Accords Cardassian UnionFerengi AllianceKlingon EmpireUnited Federation of Planets
Typhon Pact Breen ConfederacyGorn HegemonyHoly Order of the KinshayaRomulan Star EmpireTholian AssemblyTzenkethi Coalition
Khitomer Alliance Cardassian UnionDeferiDelta AllianceDominionFerengi AllianceKlingon EmpireLukari ConcordiumRomulan RepublicUnited Federation of PlanetsVoth Separatists
non-aligned states CortDaa'Vit ConfederacyDanteri EmpireFirst FederationGottar HegemonyGrigariHydran KingdomImperial Klingon StatesInterstellar ConcordiumJibetian ConfederacyKarg EmpireKentari UnionKzinti PatriarchyLyran Star EmpireMentosh AssemblyMetron ConsortiumNew Thallonian ProtectorateNyberrite AllianceOrion ColoniesPatriarchyRegnancy of the Carnelian ThroneSattar CollectiveSheliak CorporateShirn AllianceTalarian RepublicTarn EmpireTezwaTirrion AssemblyUbarrak PrimacyVenette ConventionVomnin Confederacy
defunct states Hiram AssemblyHradrian EmpireHusnock Star KingdomImperial Romulan StatePartnership of CivilizationsStellar Kingdom of CorillThallonian EmpireThelasian Trading ConfederacyZalkat Union
states unique to the mirror universe Galactic CommonwealthKlingon-Cardassian AllianceTerran EmpireTerran Republic
states from other alternate timelines AllianceErdenreichGalactic UnionIconian-Dominion AllianceInterstellar AxisInterstellar CoalitionInterstellar UnionKlingon-Andorian CompactVulcan-Andorian EmpireVulcan ProtectorateVulcan Star Empire