Military alliance

North German Confederation Holy League of 1511 Central Powers Triple Alliance Holy Alliance Five Eyes Pact of Steel Holy League of 1717 Western European Union Allies of the First World War Islamic Military Counter Terrorism Coalition collective security Dual Alliance Balkan League Ottoman-German Alliance Italic League Southeast Asia Treaty Organization Anglo-Portuguese Alliance Polish–Romanian alliance Anzus Five Power Defence Arrangements Collective Security Treaty Organization Polish–Prussian alliance GUAM Organization for Democracy and Economic Development Allies of the Second World War Triple Alliance Warsaw Pact Axis Powers Franks Axis of Resistance First League of Armed Neutrality Heilbronn League Anglo-Japanese Alliance Grand Alliance Habsburg–Persian alliance Arab–Israeli alliance against Iran International Maritime Security Construct Holy League North Atlantic Treaty Organization Catholic League Auld Alliance Western Union Second League of Armed Neutrality Holy League of 1332