Alliance
An alliance was an agreement or treaty between two or more groups. A political alliance was a political agreement made to advance of common goals or interests, such as to aid in trade benefits or concessions. A military alliance was a military agreement designed to foster mutual defense of territories in military situations. An individual who belonged to an alliance were known as an ally.

The United Federation of Planets was an interstellar alliance of creatures who had similar beliefs. ()

Some other examples of political alliances include:
 A  on a planet encountered by  in 2152. ()
 A cadre on Turkana IV known as the Turkana IV Alliance. ()
 The European Alliance on Earth, a nation-state. ()
 Klingon-Cardassian Alliance, the dominant 24th century military power in the mirror universe Alpha Quadrant. ()
 The Bajoran Alliance for Global Unity. ()
 The Nyberrite Alliance, an interstellar power located on the edge of Federation space. ()

In addition, a number of military alliances were formed, including:
 In an alternate timeline, the Na'kuhl forged an alliance with the Nazis during World War II. ()
 A pre-Federation military  was created to stop a common threat to several species in 2154. ()
 An Earth / Andorian / Vulcan / Tellarite alliance decisively defeated the Romulan Empire at the Battle of Cheron in 2160, thereby effectively ending the Earth-Romulan War. ()
 The Federation Alliance, consisted of forces allied against the Dominion during the Dominion War. ()
 Kathryn Janeway forged a temporary alliance with the Borg in early 2374. ()
 The Breen and the Dominion formed the Breen-Dominion Alliance in 2375. ()
 The Alliance was the name given to the combined forces of four ships that pooled their resources to escape a subspace anomaly in the Delta Quadrant known as "". The Alliance included a Nygean ship, a Hierarchy scout ship, an unnamed vessel, and the USS Voyager. ()

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