Lansdowne Football Club, is a rugby union team based in Dublin, Ireland. Called Football Club instead of Rugby Football Club due to being founded before the formation of the IRFU. It was founded in 1872 by Henry Dunlop as the Irish Champion Athletic Club. Its senior team currently plays in Division 1A of the All-Ireland League. The club's playing colours are black, red and yellow hoops, with navy shorts.

Lansdowne have won the Leinster Senior Cup a record 29 times, winning it for the first in 1891. Lansdowne won the All Ireland League for the first time in March 2013 and also won the Fraser McMullen cup in the same season. Lansdowne completed the "All Ireland Double" again in May 2015 winning the All Ireland League and the Fraser McMullen again. In 2017/2018 captained by Ian Prendiville & coached by Mike Ruddock & Mark McHugh Lansdowne won the All Ireland League, The Bateman Cup, The Leinster Senior Cup and The Leinster Senior League Cup. Lansdowne is the first ever Leinster team to win all of these trophies in one season.

Together with Wanderers, Lansdowne have shared the use of Lansdowne Road since 1880, with each club having their own clubhouse at opposite ends of the ground. However, since 1974 the ground itself has been owned by the IRFU.

99-00, **2012-13, 2014–15, 2022-23

The following Lansdowne players have played for the Ireland national rugby sevens team:

4 Lansdowne players represented Ireland at the Tokyo 2020 Olympics : Adam Leavy, Mark Roche, Foster Horan, Ian Fitzpatrick

1 Lansdowne player represented Ireland at the Paris 2024 OLympics : Mark Roche

118 Lansdowne players have represented Ireland at full international level. The latest Lansdowne player to be capped by Ireland is Harry Byrne. On two occasions in 1931, Lansdowne supplied the entire Irish three-quarter line (Jack Arigho, Eugene Davy, Morgan Crowe and Ned Lightfoot), one of only three clubs ever to have done so at international level world-wide.