Military alliance

A **military alliance** is an alliance that is made with the express purpose of military matters and promises the defense of all of its members.

## Historic military alliances

- Medic Wars
    - Hellenic League - Athens, Lacedemonia, Macedon, others
- Peloponnesian War
    - League of Delos - Athens, Chios, Samos, Lesbos, others
    - Peloponnesian League - Lacedemonia, Corinth, Elis, others
- Wars of Scottish Independence
    - Auld Alliance - Scotland, Norway, France
- Italian Wars
    - League of Cambrai - The Papal States, France, Aragon, Holy Roman Empire
    - Catholic League (Italian) - The Papal States, Venice, England, Aragon, Holy Roman Empire
- Schmalkaldic War
    - Schmalkaldic League - German Protestant States
- Anglo-Portuguese Alliance -  England (succeeded by the United Kingdom) and Portugal, since 1373
- Luso-Islamic War
    - Ethio-Portuguese Treaties - Portugal, Ethiopia
- Thirty Years' War
    - Catholic League (German) - Bavaria, other Catholic German States
    - Protestant Union - Protestant German States
- War of the Grand Alliance (Nine Years War)
    - League of Augsburg - The Netherlands, Holy Roman Empire, Spain, Austria, other German states
- War of the Spanish Succession
    - The Quadruple Alliance of 1718
- Napoleonic Wars
    - The Quadruple Alliance of 1814/15
    - First through Seventh Coalitions
- The Quadruple Alliance of 1834
- Anglo-Japanese Alliance - United Kingdom and Japan
- World War I
    - the Entente and the Allies - United Kingdom, France, Serbia, New Zealand, Australia, Russia (to 1917), Romania (from 1916), United States (from 1917)
    - the Central Powers - German Empire, Austria-Hungary, Ottoman Empire, Bulgaria
- World War II
    - the Axis - Nazi Germany, Empire of Japan, Fascist Italy, and many others.
    - the Allies - United Kingdom and the Commonwealth, Free France, United States, Soviet Union, Republic of China, many others.
- Cold War
    - Western European Union (WEU) - currently in process of merging into CFSP and ESDP (see below)
    - North Atlantic Treaty Organisation (NATO) -- United States, Canada, most of Western Europe (_still an active alliance_)
    - Warsaw Pact - Soviet Union,  East Germany, Bulgaria, Hungary, Poland, Czechoslovakia, Romania
    - Southeast Asia Treaty Organisation (SEATO) - United States, United Kingdom, France, Australia, Burma, New Zealand, Pakistan, Thailand, Philippines
    - Central Treaty Organisation (CENTO) - United States, United Kingdom, Turkey, Iran, Iraq, Pakistan
    - ANZUS - United States, Australia, New Zealand (_still an active alliance_)
    - Five Powers Pact - Australia, Malaysia, New Zealand, Singapore, United Kingdom (_still an active alliance_)

## Current military alliances and economic assistance

- North Atlantic Treaty Organisation (NATO) - United States, United Kingdom, Canada, most of Western Europe and Central Europe, parts of Eastern Europe, and Turkey.
- Collective Security Treaty Organization (CSTO) - Russia, Belarus, Armenia, Kazakhstan, Kyrgyzstan, Tajikistan
- Common Foreign and Security Policy (CFSP) and European Security and Defence Policy (ESDP) of the European Union.
- Five Power Defence Arrangements (FPDA) - United Kingdom, Australia, New Zealand, Malaysia, Singapore.
- ANZUS Treaty (ANZUS) - United States, Australia, New Zealand.
- ECOMOG of Economic Community of West African States Monitoring Group.
- Council for Peace and Security in Central Africa (COPAX) of Economic Community of Central African States.
- Inter-American Treaty of Reciprocal Assistance (Rio Pact) - Most of the countries of the Americas.
- North American Aerospace Defense Command (NORAD) - United States and Canada. NORAD and other defense agreements (such as the Permanent Joint Board on Defense) form the most extensive defense alliance in the world.
- Regional Security System (RSS) - several Eastern Caribbean countries.
- Shanghai Cooperation Organisation (SCO), political, economic and military organisation - China, Russia, India, Pakistan, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan.
- Brazil, Russia, India, China, South Africa (BRICS) - economic and military assistance.