An alliance is an agreement between two or more parties, made in order to advance common goals and to secure common interests.

In politics 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 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
• 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 (Hong Kong), political group in Hong Kong
• United People Alliance, electoral and political coalition between the Portuguese Communist Party or PCP and the Portuguese Democratic Movement or MDP

In geography it may refer to:

• Alliance, Alberta
• Alliance, Nebraska
• Alliance, North Carolina
• Alliance, Ohio

In fiction it may refer to:

• 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 (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, a faction in the Warcraft Universe comprised of the Humans, Night Elves, Dwarves, and Gnomes

In other fields it may refer to:

• Alliance (Bible), Torah event
• Alliance Air, a low-cost carrier based in Delhi, India
• Business alliance, agreement between businesses
• Military alliance, agreement between two, or more, countries
• The Alliance, professional wrestling faction which ostensibly consisted of World Championship Wrestling and Extreme Championship Wrestling
• The Alliance (The Office episode), an episode of the television series The Office

See also:

• Confederacy (disambiguation)

حلف | Aliance | Bündnis | Alliance | Alliantie | 同盟 | Allianse | Aliança | Альянс | Aliansa | Allians