In the Civilization and Call to Power games and Sid Meier's Alpha Centauri, an alliance is a special relationship formed between two civilizations for mutual benefit. It is usually the closest level of diplomatic relations available in each game.
Civilization III
Civilization IV
Civilization V
Declarations of Friendship fill the role of alliances. AI leaders will offer more favorable trades after declaring friendship with a partner, and can also form Research Agreements. Declaring friendship does not prevent either partner from denouncing or declaring war on the other, however.
Civilization VI
Forming an 
Alliance with another civilization prevents both allies from denouncing, declaring war on, or spying on each other. It also provides Open Borders and Shared Visibility, allowing each ally to see everything on the map that the other's units and cities can see. The Rise and Fall expansion adds new types of Alliances that provide various and evolving benefits.
Civilization VII
Civilization: Beyond Earth
Civilization: Call to Power
Call to Power II
Sid Meier's Alpha Centauri
Other games
Alliance is not present in (or the article has not been created for) the following games :
| Game | Article |
|---|---|
| Civilization | Alliance (Civ1) |
| Civilization II | Alliance (Civ2) |
| Civilization Revolution | Alliance (CivRev) |
| Civilization Revolution 2 | Alliance (CivRev2) |
| CivWorld | Alliance (CivWorld) |
| Freeciv | Alliance (Freeciv) |
| C-evo | Alliance (C-evo) |
| Sid Meier's Colonization | Alliance (Col) |
| FreeCol | Alliance (FreeCol) |
| Civilization IV: Colonization | Alliance (Civ4Col) |
| Starships | Alliance (Starships) |
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