An is an agreement between two or more parties, made in order to advance common goals and to secure common interests. It may refer to:
- Alberta Alliance Party , right wing political party in Alberta, Canada
- ''Alliance'', the former name of the Barisan Nasional in Malaysia
- Alliance (Iceland) , political party in Iceland
- Alliance (New Zealand Political Party) , left-wing political party in New Zealand politics
- Alliance 90 , an alliance of 3 opposition groups in East Germany
- Alliance For Chile , a political coalition that includes Chiles two rightwing parties RN and UDI
- Alliance For Sweden , an electoral and governing (since September 2006) political coalition between the Moderate Party, Centre Party, Liberal People's Party and Christian Democrats
- Alliance For The Planet (L’Alliance pour la planète) {Link without Title}
- Alliance Party Of Northern Ireland , political party operating in Northern Ireland
- Canadian Alliance , Canadian right-of-centre conservative political party that existed from 2000 to 2003
- Fijian Alliance , a former political party in Fiji
- Melanesian Alliance Party , a political party in Papua New Guinea
- People's Alliance Party , a political party in the Solomon Islands
- ProLife Alliance , a political party in the United Kingdom
- SDP-Liberal Alliance , electoral alliance of the Social Democratic Party and the Liberal Party in the United Kingdom that operated from 1981 to 1988
- The Alliance, the predecessor of the Barisan Nasional political coalition in Malaysia.
- The Alliance (Hong Kong) , political group in Hong Kong
- Tongmenghui (or "Revolutionary Alliance"), an underground resistance movement in Japan from 1905 to 1912
- United Iraqi Alliance , a political coalition in Iraq
- United People Alliance , electoral and political coalition between the Portuguese Communist Party or PCP and the Portuguese Democratic Movement or MDP
- National Alliance (disambiguation) , several political parties
- National Democratic Alliance , several political parties
- New Alliance Party (disambiguation) , several political parties
- AmEuropa , a proposed economic and political Transatlantic alliance
- Alliance (company) , a marketing company controlled by WPP
- Alliance (1904 Automobile) , an early German automobile
- Alliance (1905 Automobile) , an early French automobile
- Alliance Air , a low-cost carrier based in Delhi, India
- Alliance Airlines , a charter airline based in Brisbane, Australia
- Alliance Air (Uganda) , an airline based in Kampala, Uganda
- Alliance Atlantis , a Toronto-based media company
- Alliance Entertainment , an independent distributor of music, movies, and game software
- Alliance Records , a record label
- Alliance Semiconductor , an electronic chip maker in Santa Clara, California
- Alliance & Leicester , a British bank
- The Alliance (publication) , an American publication of the 1870s
- Business Alliance , an agreement between businesses
- '' Alliance (Star Fleet Universe) '', a group in the ''Star Fleet Universe'' in the ''General War'' era
- Anglo-Sino Alliance , powerful government and law-enforcement organization that controls a large sector of colonized "core planets" in the Firefly television series
- Earth Alliance (Gundam) , a military alliance that controls most of the Earth in the Japanese anime TV series Gundam Seed
- Earth Alliance (Babylon 5) , fictional alliance of the countries of Earth in the television series Babylon 5
- Ferengi Alliance , fictional extraterrestrial race from the Star Trek universe
- Rebel Alliance , interstellar political resistance force formed in direct military opposition to the Galactic Empire in the fictional Star Wars universe
- The Alliance (Warcraft) , a faction in the Warcraft Universe comprised of the Humans, Night Elves, Dwarves, Draenei and Gnomes
- United Alliance Of Evil from the Power Rangers TV series.
- Alliance Of Twelve from the Alias TV series
- Alliance (Bible) , Torah event
- Christian And Missionary Alliance , an evangelical Christian denomination
- The Alliance , professional wrestling faction which ostensibly consisted of World Championship Wrestling and Extreme Championship Wrestling
- The Alliance (dancehall) , a group of Dancehall deejays
- The Alliance (The Office Episode) , an episode of the television series ''The Office''
- Alliance To End Hulkamania , professional wrestling stable in World Championship Wrestling
- In taxonomy, a division between Subtribe and Genus
- Military Alliance , an agreement between two, or more, countries
- Alliance , a computer program that provides a private and secure environment to share files and communicate with people you know
- The Alliance , a hip-hop group known for their single "Tattoo".
- The Alliance Theatre Company , based in Atlanta, Georgia
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