Belvedere, sometimes known as Belvo, has a strong rugby union football tradition, being one of the traditional "Big Three", along with Blackrock College and Terenure College. In 2005, for the first time in the school's history, it won both the Leinster Junior Cup and the Leinster Schools Senior Cup. In 2016 Belvedere, with eleven titles, stood second in the Leinster Senior Cup roll of honour, behind Blackrock College (68). A further success came on March 17, 2017, when Belvedere beat Blackrock College 10-3 at the RDS.