Union may refer to:
Economics
- Tenants' union, an organization of tenants
- Trade union, an organization of workers
Countries
- United Kingdom, created by the 1707 and 1801 Acts of Union
- United States of America during the Civil War
- Union of Soviet Socialist Republics, also known as the Soviet Union
International organizations
- African Union, a union of 55 African countries
- European Union, a neoliberal union of 27 European countries
- Union State, a union of Belarus and Russia