Original Umbro football shirt Shamrock Rovers F.C. 2007

Shamrock Rovers Football Club is an Irish professional football club based in Tallaght, South Dublin. The club's senior team competes in the League of Ireland Premier Division and it is the most successful club in the Republic of Ireland. The club has won the League of Ireland title a record 20 times and the FAI Cup a record 25 times. Shamrock Rovers have supplied more players to the Republic of Ireland national football team (64) than any other club. In All-Ireland competitions, such as the Intercity Cup, they hold the record for winning the most titles, having won seven cups overall.

Shamrock Rovers were founded in Ringsend, Dublin. The official date of the club's foundation is 1899. They won the League title at the first attempt in the 1922–23 season and established themselves as Republic of Ireland most successful club by 1949, winning 44 major trophies. During the 1950s, the club won three League titles and two FAI Cups and became the first Irish team to compete in European competition, playing in the European Cup in 1957.

They followed this by winning a record six FAI Cups in succession in the 1960s, when they were also one of the European club teams that spent the summer of 1967 in the United States, founding the United Soccer Association. They won the first of four League titles in a row in 1983–84, after a long decline.

The club played at Glenmalure Park from 1926 to 1987 when the owners controversially sold the stadium to property developers. Shamrock Rovers spent the next 22 years playing home games at various venues around Dublin and on occasions, Ireland. They moved into Tallaght Stadium prior to the start of the 2009 season after years of delays and legal disputes, during which time the club's supporters saved them from extinction.

Shamrock Rovers wore green and white striped jerseys until 1926 when they adopted the green and white hooped strip that they have worn ever since. Their club badge has featured a football and a shamrock throughout their history. The club has a relatively large support base and shares an intense rivalry with Bohemian Football Club and St Patrick's Athletic. On 25 August 2011 Rovers became the first Irish side to reach the group stages of either of the top two European competitions by beating Partizan Belgrade in the play-off round of the Europa League.