List of military alliances
A military alliance is a legally binding treaty between two or more parties in which the contracting parties agree to mutually protect one another militarily in case of an armed conflict. Military alliances differ from coalitions, which are formed in response to a specific crisis and last until the crisis is resolved. Numerous forms of military and defensive alliances have existed between states since early human history. This is a comprehensive list of the most important alliances.
Before AD 1200
| Legend | |
|---|---|
| Active military alliances | |
| Years | Name | Members |
|---|---|---|
| c. 7th century–338 BC | Latin League | About 30 villages and tribes in the region of Latium |
| c. 6th century–366 BC | Peloponnesian League | Various city-states in the Peloponnese, dominated by Sparta |
| 493 BC | Foedus Cassianum | Roman Republic Latin League |
| 478–404 BC | Delian League | See Members of the Delian League |
| 215 BC | Macedonian–Carthaginian Treaty | Macedonia Carthage |
| 433–554 | Silla–Baekje Alliance | Silla Baekje |
| 1123 | Pactum Warmundi | Kingdom of Jerusalem Republic of Venice |
| 1167–1250 | Lombard League | Numerous cities in medieval Lombardy, modern Northern Italy |
1200–1899
| Legend | |
|---|---|
| Active military alliances | |
1900–1944
| Legend | |
|---|---|
| Active military alliances | |
1945–present
| Legend | |
|---|---|
| Active military alliances | |
See also
Notes
- ^ See also Anglo-Portuguese Alliance
- ^ The Nahua Triple Alliance is also known as the Mexica, or Aztec Empire
- ^ Austrlo-Russian alliance broke off in 1853.
- ^ See also Lancaster House Treaties
- ^ Effectively ended in 1943
- ^ (Two days only)
- ^ See also Treaty of Brussels
- ^ Treaty in-force with United States
- ^ Treaty in-force with Thailand
- ^ Joined as West Germany until 1990
- ^ Military wing of Gulf Cooperation Council (GCC)
- ^ Agreement applies only between the United States and Allied States
- ^ Taiwan is treated as an MNNA without formal designation
- ^ See also Shusha Declaration
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References
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- ^ "Treaties in Force A List of Treaties and Other International Agreements of the United States in Force on January 1, 2020" (PDF). Treaty Affairs Staff, Office of the Legal Adviser, U.S. Department of State. 1 January 2020. Retrieved 7 March 2025.
Declaration by the Prime Minister of Canada and the President of the United States of America regarding the establishing of a Permanent Joint Board on Defense.
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- ^ The International Institute for Strategic Studies (February 2025). The Military Balance 2025. London: Routledge. ISBN 9781041049678. ISSN 0459-7222.
- ^ "Nuclear risks grow as new arms race looms—new SIPRI Yearbook out now". www.sipri.org. 16 June 2025. Retrieved 12 July 2025.
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- ^ a b "World Directory of Modern Military Aircraft". www.wdmma.org. Retrieved 13 February 2025.
- ^ a b c d e f g h i j k l "Global Firepower Countries Index". www.globalfirepower.com. Retrieved 22 May 2025.