The term alliance might refer to:
- The Alliance of 2154 between Andorians, Tellarites, Humans, and Vulcans.
- The Alliance, one of the powerful cadres on Turkana IV in the 24th century.
- The Alliance, one of the political organizations on the pre-warp planet from ENT: "Communicator".
- Alliance for Global Unity, also known as The Circle, a Bajoran extremist faction.
- European Alliance, a political entity based in Europe on Earth.
- Federation Alliance, the accord between the Federation, the Klingon Empire, and the Romulan Star Empire during the Dominion War.
- Klingon-Cardassian Alliance, the dominant power in the Mirror Universe in the 24th century.
- Nyberrite Alliance, a political entity some distance from Deep Space 9 with good relations with the Klingon Empire and Federation.
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