The Leinster Schools Rugby Senior League is a rugby union competition for secondary schools affiliated to the Leinster Branch of the IRFU. It is played before Christmas, after which the Leinster Schools Rugby Senior Cup is played. It is a 15 school competition played by the strongest schools outside of the "Big Six”. The so-called "Big Six" of Leinster schools rugby (Blackrock College, Clongowes Wood College, St Mary's College, Dublin, Terenure College, Belvedere College and St Michael's College, Dublin) do not participate in the competition, although St Michael's College, Dublin used to participate in the competition winning it in 1998. For the most part it is participated in by mostly private schools but 4 public schools participate in it as well. Schools in the league often provide the biggest form of competition to the "Big Six" in the Leinster Schools Rugby Senior Cup. Schools that participated in the league, outside of the "Big Six" that has gone to win the Leinster Schools Rugby Senior Cup: Cistercian College, Roscrea (2015) against Belvedere College, Newbridge College (2020, shared with Clongowes Wood College due to COVID-19 pandemic) and Gonzaga College (2023) against Blackrock College.
Winners +YearWinnerRunner-up1994Castleknock College1995Cistercian College, Roscrea1996Newbridge College1997The King's Hospital1998St. Michael's College1999St. Andrew's CollegeGonzaga College2000Wesley College2001Castleknock College2002Cistercian College, RoscreaC.B.C Monkstown2003Templeogue College2004The King's HospitalC.B.C Monkstown2005Gonzaga CollegeSt. Gerard's School2006Cistercian College, RoscreaGonzaga College2007Gonzaga College2008C.B.C Monkstown2009St. Gerard's School2010St. Gerard's School2011St. Gerard's School2012Kilkenny CollegeCastleknock College2013Newbridge CollegeCistercian College, Roscrea2014Newbridge CollegeCistercian College, Roscrea2015Cistercian College, Roscrea2016Gonzaga CollegeCistercian College, Roscrea2017St. Gerard's SchoolGonzaga College2018Gonzaga CollegeCastleknock College2019Gonzaga CollegeCistercian College, Roscrea2020No competition due to COVID-19 Pandemic2021Gonzaga CollegeKilkenny College2022Gonzaga CollegeNewbridge College2023Gonzaga CollegeNewbridge College2024Gonzaga CollegeNewbridge College2025Wesley CollegeNewbridge College School with the most titles: Gonzaga College (9 titles) Most straight titles in a row: Gonzaga College, 6 titles in a row.
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