is a senior Irish rugby union club based on Anglesea Road in Ballsbridge, Dublin, Ireland.

At the final meeting during their debut season, it was decided to enter senior rugby union and open the club to other Jesuit college students and "to outsiders, who may wish to join us."

On Saint Patrick's Day 1920, Old Belvedere played their first Leinster Senior Cup game which they lost 0–3 to Wanderers.

Six future club presidents - George J. Morgan, Eddie Gleeson, Tommy Whelan, Paddy Kevans, John Cummins and Bob O'Connell - all played in this final.

[3][4] Old Belvedere recorded their first win in the Leinster Senior Cup in 1940 when they defeated Blackrock College 11–6 after receiving a bye into the second round.

Tom McGurk and the former St Mary's centre, Gary O'Hagan, became the first two non–Belvederian players to play for Old Belvedere since the club's earliest days.

[3][4] In 1990 Ollie Campbell contacted Dr. Oliver Bourke, a friend who had emigrated to New Zealand, about the possibility of sending Old Belvedere youth players to Timaru for the summer.

[3][4] In 2006–07, with a team captained by Scott Hutton and featuring Andrew Dunne, Old Belvedere won their eleventh Leinster Senior Cup after a lapse of thirty nine years.

[9] Old Belvedere won the 2010–11 All-Ireland League title after defeating Cork Constitution 20–17 in the final at Donnybrook Stadium on 1 May 2011.

The original Old Belvedere team continued to play at Beech Hill before briefly relocating to Vernon Avenue.

The ground lease on Anglesea Road was acquired in 1944 but the first match was not played there until February 1949 due to the amount of work required to level and drain the pitches.