Union Treaty may refer to: Treaty on the Creation of the Union of Soviet Socialist Republics (1922) New Union Treaty (1991), proposed treaty on the creation of the Union of Soviet Sovereign Republics or the Union of Sovereign States Treaty on European Union (1992/2007) Treaty of Union (1707), creating the Kingdom of Great Britain Treaty of Union (1790), creating the United States of Belgium
See also Act of Union (disambiguation) Treaty of Federation