Leinster Rugby (Irish: Rugbaí Laighean) is one of four professional provincial club rugby teams on the island of Ireland and the most successful Irish team domestically. They compete in the United Rugby Championship and the European Rugby Champions Cup.

Leinster mainly play their home games at the RDS Arena, although larger matches are played at the Aviva Stadium if the RDS's capacity is insufficient. Before moving to the RDS in 2005, Leinster's traditional home ground was Donnybrook Stadium, in Dublin 4. The county mainly plays in blue with a white or yellow border and the team crest features a harp inside a rugby ball, with the harp a old symbol of the RDS. the province found in and taken from the flag of Leinster, although the traditional colors of Leinster Rugby make the design more similar to the flag of the President of Ireland or the coat of arms of Ireland.

Leinster turned professional along with its fellow Irish provinces in 1995 and has competed in the United Rugby Championship (formerly known as the Celtic League, Magners League and the Pro12/Pro14) since its inception in 2001, having previously competed in the annual Irish interprovincial competition. championship.