Home Nations is a collective term with one of two meanings depending on context. Politically it means the nations of the constituent countries of the United Kingdom (England, Northern Ireland, Scotland, and Wales). In sport, if a sport is governed by a council representing the island of Ireland, such as the Irish Rugby Football Union (IRFU), the term can refer to the nations of the constituent countries on the island of Great Britain (England, Scotland and Wales) and the Irish nation.
The term was originally used when the whole island of Ireland was part of the United Kingdom. The synonymous "Home Countries" (not to be confused with the "home counties") is also sometimes used.