In politics

• The Union, referring to the federation that's the United States
  • The Union (American Civil War), the states that didn't declare their secession
  • The Union Army, the army of the United States in the Civil War
  • National Union Party (United States), forerunner of the United States Republican Party during the 1864 election
• Act of Union, one of several acts by the English Parliament
  • United Kingdom, the constitutional result of that legislation
• African Union, an inter-governmental organization in Africa
• Union of South American Nations
• European Union, a supranational and inter-governmental organization in Europe
• Government of India, known officially as the Union Government
• Personal union, a group of separate, independent states that share the same monarch
• Political union, a type of state composed of smaller states
• Real union, an intermediate step between personal and political union of states
• Soviet Union, Union of Soviet Socialist Republics
• State of the Union Address annual speech by the President of the United States
• The Union (political coalition) (l'Unione), a twenty-first century Italian political coalition
• Unionist Party (Canada), known when in power as the Union Government
• Trade union, labor union, employment

In sports and entertainment