The Irish Rugby Football Union (IRFU) is the body managing rugby union in the island of Ireland. The IRFU has its head office at 10/12 Lansdowne Road and home ground at Aviva Stadium, where adult men's Irish rugby union international matches are played. In addition, the Union also owns the Ravenhill Stadium in Belfast, Thomond Park in Limerick and a number of grounds in provincial areas that have been rented to clubs.

Rugby union football, commonly known simply as rugby union or more often just rugby, is a close-contact team sport that originated at Rugby School in England in the first half of the 19th century. Rugby is simply based on running with the ball in hand. In its most common form, a game is played between two teams of 15 players each, using an oval-shaped ball on a rectangular field called a pitch. The field has H-shaped goalposts at both ends.