Romulan Star Republic | Star Trek Expanded Universe | Fandom

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For the organization in Star Trek: Arcadia continuity, see Romulan Republic

The Romulan Star Republic (formerly the Romulan Star Empire) was home to the Romulans. (Star Trek: Unity)

Galactic powers of the Milky Way

Alpha and Beta Quadrants

Gamma Quadrant

Delta Quadrant

Extant powers:

Major: Breen Confederacy | Cardassian Union | Klingon Empire | Romulan Free State | Tholian Assembly | United Federation of Planets
Minor: Affiliation of Outer Free Worlds | Carnelian Throne | Dregon Continuum | Ferengi Alliance | Garidian Republic | Gorn Hegemony | Grigari | Hydran Kingdom | Imperial Klingon States | Interstellar Concordium | Holy Order of the Kinshaya | Kzinti Patriarchy | Lyran Star Empire | M'dok Empire | Metron Consortium | Orion Congeries | Othan Empire | Sheliak Corporate | Solar Belt Confederation | Son'a | Suculon Empire | Children of Tama | Talarian Republic | Taurhai Unity | Thallonian Protectorate | Tzenkethi Coalition
Alliances: Federation Alliance | Khitomer Accords | Typhon Pact

Dominion | Nyberrite Alliance

Alsuran Empire | Borg Collective | Briori | Devore Imperium | Grigari | Kazon Collective | Krenim Imperium | Vidiian Sodality | Voth

Defunct powers:

Arretian Empire | Barrier Alliance | Chodak Empire | Coalition of Planets | Furies | Iconian Empire | Imperial Romulan State | Orion Empires | Preservers | Progenitors | Romulan Star Empire | Shedai | Slaver Empire | Taygenian Cooperative | Thallonian Empire | Tkon Empire | Vegan Tyranny | Vhorani

Furies | Vaadwaur

Fanon continuities:

Alliance | Alshain Exarchate | Cardassian Theonomy | Cha'ouw Empire | Colonial Alliance | Directorate | Fashod Empire | Grand Duchy of Rhkan | Hirazi Coalition | Kellarian Republic | Nikon Empire | Pilmarian Union of Planets | Rellazi Commonwealth | Romulan Confederacy | Romulan Republic | Romulan Star Republic | Steranmio Alliance | State of Pocket

Tryesharan Alliance

Falcarian Allegiance | Ssoran Hegemony |

Extragalactic and extradimensional powers

Andromeda Galaxy: Archein Empire | Kelvan Empire |

Mirror universe: Galactic Commonwealth | Imperial Union of Planets | Klingon-Cardassian Alliance | Romulan Republic | Romulan Technocracy | Terran Empire | Third Terran Dominion

Other dimensions: Nacene | Q Continuum | Species 8472 | Sphere Builders

See also

Diplomacy and law | Government

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