Union commonly refers to:

Trade union, an organization of workers
Union (set theory), in mathematics, a fundamental operation on setsUnion may also refer to:

Arts and entertainment
Music
Union (band), an American rock group
Union (Union album), 1998
Union (Chara album), 2007
Union (Toni Childs album), 1988
Union (Cuff the Duke album), 2012
Union (Paradoxical Frog album), 2011
Union, a 2001 album by Puya
Union, a 2001 album by Rasa
Union (Son Volt album), 2019
Union (The Boxer Rebellion album), 2009
Union (Yes album), 1991
"Union" (Black Eyed Peas song), 2005

Other uses in arts and entertainment
Union (Star Wars), a Dark Horse comics limited series
Union, in the fictional Alliance–Union universe of C. J. Cherryh
Union (Horse with Two Discs), a bronze sculpture by Christopher Le Brun, 1999–2000
The Union (Marvel Team), a Marvel Comics superhero team and comic series

Education
Union Academy (disambiguation), the name of several institutions
Union College (disambiguation), the name of several institutions
Union Institute & University, in Ohio, U.S.
Union Presbyterian Seminary, in Virginia, U.S.
Union Public Schools, a school district in Oklahoma, U.S.
Union School of Theology, in Wales
Union Theological College, in Northern Ireland
Union Theological Seminary (disambiguation), the name of several institutions
Union University (disambiguation), the name of several institutions

History and politics
Economic union, a type of trade bloc
Political union, a type of state which is composed of or created out of smaller states
Personal union, the combination of two or more states that have the same monarch
Poor law union, a former unit of local government in the United Kingdom
Real union, a union of two or more states, which share some state institutions
CDU/CSU, or the Union, a German political alliance
Union (American Civil War), U.S. states that were loyal to the U.S. federal government
Union (Hungarian-German trade union council)
Union (Madagascar), a political party

Places
Canada
Union, Elgin County, Ontario
Union, Leeds and Grenville United Counties, Ontario
Union, Nova Scotia
Union, Prince Edward Island

United States
Union, Alabama
Union, Connecticut
Union, Illinois
Union, Logan County, Illinois
Union, Indiana
Union, Iowa
Union, Kentucky
Union, Louisiana
Union Parish, Louisiana
Union, Maine
Union, Mississippi
Union, Missouri, in Franklin County
Union, Clark County, Missouri
Union, Nebraska
Union, New Hampshire
Union (CDP), New Jersey
Union (hamlet), New York, in Madison County
Union, New York, in Broome County
Union, Ohio, a city in Montgomery and Miami Counties
Union, Oregon
Union, Pennsylvania (disambiguation)
Union, South Carolina
Union, Texas
Union, Virginia
Union, Washington
Union, West Virginia
Union, Barbour County, West Virginia
Union, Wisconsin (disambiguation)
Union Township, New Jersey (disambiguation)
Arcata, California, first settled as Union
Mount Union (Arizona)

Elsewhere
Union, Grenada
Unión, Paraguay
Union, Bohol, Philippines
Union, Dapa, Philippines
Union Island, Saint Vincent and the Grenadines

Science and mathematics
Union (set theory), in mathematics, a fundamental operation on sets
Union (SQL), an set operation
Union type, in computer science, a type of data structure

Sports
1. FC Union Berlin, a German association football club
Chicago Unions, a professional, Black baseball team that played in the US in the late 19th century, prior to the formation of the Negro leagues.
Chicago Union Giants, a former American baseball team in the Negro leagues
Philadelphia Union, a soccer team
Royale Union Saint-Gilloise, a Belgian association football club
Union Race Course, formerly in San Francisco, U.S.

Other uses
Union (automobile), made by the Union Automobile Company 1902–1905
Union (plumbing), a pipe fitting
Union (United States coin), a proposed $100 coin
List of ships named Union
Gabrielle Union (born 1972), an American actress

See also

All pages with titles beginning with Union
All pages with titles containing Union
Union Bank (disambiguation)
The Union (disambiguation)
Reunion (disambiguation)
European Union
Government of India, the union government created by the constitution of India
Dominion of India, or Union of India, an independent dominion in the Commonwealth 1947–1950
Marriage, a culturally recognised union between people
Soyuz ('Union'), an internal abbreviation for the Union of Soviet Socialist Republics
Students' union
Union State, of Russia and Belarus
United Kingdom
United States
Civil union