Great Britain and Ireland may refer to:
The United Kingdom of Great Britain and Ireland, the sovereign state created in 1801, combining the former Kingdom of Great Britain with Ireland, separated by the Anglo-Irish Treaty of 1921 Great Britain and Ireland, the two largest islands in the British Isles The present-day United Kingdom and the Republic of Ireland, two sovereign states Ireland–United Kingdom relations, the relations between the Republic of Ireland and the United Kingdom
See also Terminology of the British Isles