This is an incomplete attempt at an exhaustive list of confederations.

Includes confederations of confederations.

More information Name, Period ...

Name	Period	Notes
Three Crowned Kings	600 BC-300 AD	Three Tamil dynasties which ruled in a triumvirate in Tamilakam, South Asia.
Jin (Korean state)	4th century – 2nd century BC
Byeonhan confederacy	194 BC – 42 AD
Mahan confederacy	194 BC – 6th Century AD
Jinhan confederacy	194 BC – 4th Century AD
Gaya Confederacy	42-532 AD	A Korean confederacy of territorial polities in the Nakdong River basin of southern Korea, growing out of the Byeonhan confederacy of the Samhan period.
Xianbei confederacy	93-234 AD	Nomadic empire in Eastern Asia.
Toltec Empire	496-1122 AD	Existed as a confederation between the Toltecs and the Chichimeca, simultaneously as an empire exerting control over places like Cholula.
First Turkic Khaganate	552-603 AD	Göktürk confederation in Eurasia. (unsure if actually a confederation)
Oqun/Western Turkic Khaganate	603-657/742 AD	Split from the First Turkic Khaganate. Bore the Nushibi confederation.
Muisca Confederation	c. 800-1540 AD	A confederation of Muisca chiefdoms in South America.
Kimek–Kipchak confederation	880-1035 AD	Turkic state formed by seven peoples, including the Yemek and Kipchaks, in the area between the Ob and Irtysh rivers.
League of Mayapan	987-1461 AD	Pre-Hispanic state in Yucatan.
Cuman-Kipchak Confederation	10th century-1241 AD	Confederation dominated by two Turkic nomadic tribes: the Cumans (also known as the Polovtsians or Folban) and the Kipchaks in the western part of the Eurasian Steppe.
Cinque Ports	11th Century AD - Present	A confederation of coastal towns in Kent and Sussex England that formerly existed for military and trade purposes but continues for ceremonial reasons.
Aymara kingdoms	1151-1477 AD	Alliance of native polities in South America, later conquered by the Inca Empire.
Lombard League	1167-1250 AD
Kingdom of Cusco	1200 – 1438 AD
Livonian Confederation	1207–1561 AD
Confederation of Madya-as	13th century-1569 AD	A pre-Hispanic state that was located in the Philippines.
Chalco (altépetl)	13th century – 1521 AD
Confederacy of Tlaxcala	1348 - 1520 AD
Aq Qoyunlu	1378-1503 AD
Oirat Confederation	1399-1634 AD	Confederation of four Oirat tribes.
Nogai Horde	1440s-1634 AD	Confederation formed by the Nogais in the Pontic-Caspian Steppe.
League of Lezhë	1444-1468 AD	Albanian League of nobles revolting against the Ottoman empire
Aztec Empire	1428-1521 AD	Alliance between three city states in Central America.
Menceyatos Confederation	pre - 15th century AD	Confederation on Tenerife prior to Spanish conquest of the Canary Islands. Taoro was primus inter pares.
Kwararafa Confederacy	1500-1840 AD	Multi-ethnic confederation in central Nigeria.
Confederation of Shan States	1527-1550s AD	Confederation in Myanmar that conquered the Ava Kingdom.
Chaubisi Rajya	16th century–1810 AD	A confederation of 24 states. One of these, Gorkha, would conquer the others to later form the Kingdom of Nepal.
Baise Rajya	?-1810 AD	A confederation of 22 states, later conquered by Gorkha in the unification of Nepal.
Seven Kingdoms of Kongo dia Nlaza	16th century AD	Confederation of 7 kingdoms that were conquered by the Kingdom of Kongo
Confederate States of Lanao	1616-1904 AD	Confederation on Mindanao, Philippines.
Old Swiss Confederacy	1291 – 1798 AD
Confederate Ireland	1642–1652 AD
New England Confederation	1643–1684 AD	British colonies of Massachusetts, Plymouth, Connecticut, and New Haven.
Maratha Confederacy	1671-1818 AD
Aro Confederacy	1690–1902 AD	One of the two largest precolonial and colonial empires of the Igbo (Ibo) people of West Africa. (The other being the Kingdom of Nri)
Sikh Confederacy	1748-1799 AD	Confederation of 12 Sikh states.
Heshun Confederation	1776-1839 AD	Confederation of Kongsi republics on Borneo.
United States of America	1781–1789 AD	In its first steps, the United States were a confederation of thirteen states (Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts Bay, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, and Rhode Island and Providence Plantations) organized under the Articles of Confederation. Superseded by the new government under the U.S. Constitution.
United Belgian States	1790 AD
Ekiti Confederacy	1800s-1893/1914 AD	Formed by the Ekiti people, a subset of Yoruba, in Nigeria.
Confederation of the Rhine	1806–1813 AD	Client state of the First French Empire. Dissolved after the Battle of Leipzig in the War of the Sixth Coalition.
United Provinces of New Granada	1811–1816 AD	Secessionist state in South America later reconquered by Spain
Sweden-Norway	1814–1905 AD	Personal union between Sweden and Norway. Dissolved after the 1905 Norwegian plebiscite.
German Confederation	1815–1866 AD	Created as loose confederation of German states by the Congress of Vienna to replace the Holy Roman Empire. Weakened by the Austro-Prussian rivalry and the German Revolutions of 1848 before its final dissolution after Prussia's victory in the Austro-Prussian War.
League of the Free Peoples	1815-1820 AD
Confederation of the Equator	1824 AD
Argentine Confederation	1831–1861 AD	First political organization of Argentina. Highly decentralized and without a head of state.
Peru-Bolivian Confederation	1836–1839 AD
Sonderbund	1845–1847 AD	a rival confederation of cantons in Switzerland during the Sonderbund War
Granadine Confederation	1858–1863 AD
Confederate States of America	1861–1865 AD	Confederation[citation needed] that was established by several southern slave states that seceded from the Union. It comprised 11 states: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Arkansas, North Carolina, Virginia, and Tennessee. Kentucky and Missouri were both claimed by the Confederacy but never officially declared secession. The Confederation was never officially recognized as a nation, although the United Kingdom and France recognized it as a belligerent power. Was reabsorbed by the United States after the American Civil War.
North German Confederation	1867–1871 AD	Military alliance of 22 states of Germany with the Kingdom of Prussia formed by the Augustbündnis. Superseded by the German Empire after the Franco-Prussian War in 1871.
Fante Confederacy	1867-1873 AD	Formed by the Fante people, a subset of Akan, in Ghana.
Austria-Hungary	1867–1918 AD	Personal union between the Kingdoms and Lands Represented in the Imperial Council and the Lands of the Crown of Saint Stephen. Dissolved by the Treaties of Trianon and Saint-Germain-en-Laye after World War I.
Carlist States	1872–1876 AD	Established by the Carlists in Basque provinces and Navarre during the war.
Confederated Republic of Altai	1918-1922 AD	Attempt at creating an independent Altai, but was annexed by the Soviet Union.
Republic of the Rif	1921-1926 AD
Soviet Union	1922–1936 AD	Originally it was a confederation between four soviet socialist republics (Russian Soviet Federative Socialist Republic, Ukrainian Soviet Socialist Republic, Byelorussian Soviet Socialist Republic and Transcaucasian Socialist Federative Soviet Republic). As a confederation of member states, Soviet constitutions formally defined each member republic as a sovereign state, whose membership was voluntary, and could secede at any time. Soviet constitutions of 1936-onward defined the state as a federation. Dissolved in 1991.
Northwest Chinese Soviet Federation	1935-1936 AD
Western Galla Confederation	1936 AD
Netherlands-Indonesia Union	1949-1956 AD
Federation of Rhodesia and Nyasaland	1953–1963 AD	Also known as the Central African Federation, consisting of the then-British colonies of Southern Rhodesia, Northern Rhodesia, and Nyasaland (current-day Zimbabwe, Zambia, and Malawi.)
Arab Federation	1958 AD	Ephimeral union of Jordan and Iraq. Dissolved after the overthrow of King Faisal II of Iraq in the July 14 Revolution.
United Arab Republic	1958–1961 AD	Union between Syria and Egypt. Dissolved after Syria's withdrawal following the 1961 Syrian coup d'état.
United Arab States	1958–1961 AD	Confederation between the United Arab Republic and North Yemen. Dissolved due to the breakup of the United Arab Republic.
Union of African States	1958–1961 AD	An attempt to merge Ghana, Guinea and Mali through the views of panafricanism. Dissolved due to rising tensions between the countries after the 1963 Togolese coup d'état.
Federation of Arab Republics	1972–1977 AD	An attempt to merge Libya, Egypt and Syria. Dissolved despite public approval in each of the countries due to disagreements among the governments on the terms of the merger.
Ethiopian Empire	1952–1962 AD	Federation of Ethiopia and Eritrea, an attempt to merge Eritrea and Ethiopia. Dissolved after Emperor Haile Selassie I formally annexed Eritrea to Ethiopia.
Arab Islamic Republic	1974 AD	Ephimeral proposed union of Libya and Tunisia.
Senegambia Confederation	1982–1989 AD	Confederation that included the present-day countries of Senegal and Gambia.
Confederation of Mountain Peoples of the Caucasus	1989-2000 AD	a militarized political organization in the Caucasus
Serbia and Montenegro	2003–2006 AD	Replacing the former Federal Republic of Yugoslavia. Dissolved after the 2006 Montenegrin independence referendum.
Novorossiya	2014 AD-Present	A Proposed and De facto Confederation that emerged during the War in Donbas.

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The Ancient Greeks formed many Leagues which often acted as confederations and alliances usually to combat a common enemy, These polities would often be known as symmachia and koinon.