The school was named after St. Conleth, a sixth-century Irish monk who was a moulder of precious metals and whose feast day is 4 May. The senior school has about 280 pupils and is co-educational. It has a teaching staff of 25. It has grown steadily since it opened and the school building at 28 Clyde Road, Ballsbridge, Dublin 4, is now significantly different from its original state. The Millennium extension saw the addition of a half court school hall, canteen and additional classrooms as well as a computer lab and resurfacing of playing facilities. In 2009 the school underwent reconstruction again, resulting in an additional floor and re-modelling of the interior. In November 2017, the Kevin Kelleher Wing was opened which added a performance room and study area on top of the gymnasium.
Management
Kevin D. Kelleher, former international rugby referee, was the headmaster of the school for over 46 years. Ann Sheppard was School Principal from 1988–2001 and is now CEO of St.Conleth's. Donal ó Dúlaing is the Principal of the Senior School. Angelina Hopkins is the Deputy Principal of the Senior School. Tony Kilcommons is the principal of the Junior School. Dolores Kelly is the Head of Preparatory School
Academics
The school first topped the fee-paying schools league table in 2003. And whilst it was the top of mixed schools in Dublin in recent league tables, due to its relatively small size some newspapers who carry out the research based on the latest Leaving Certificate results, decide to omit the school from the tables due to the apparent ease of reaching the top. When students elect to take up University places in Columbia or Cambridge, this has a negative effect on the tables, as if attending university abroad was a negative. Subjects offered by the school for the Leaving Certificate include but are not limited to: Maths, English, Irish, French, Biology, Chemistry, Physics, Business, Economics, Spanish, Geography, Classical Studies, Latin, History, Applied Mathematics and Art.
Sport
is considered the primary sport of the school and both Junior and Senior Cup Team are represented in the Leinster Cups. Leinster Rugby did a focus on rugby in St. Conleth's in 2016 to recognise its successes that year. St. Conleth's has appeared in a couple of finals, winning a couple in recent years. St. Conleth's have participated in fencing for decades and is available as a sport in the school for both boys and girls from a young age. In June 2019, a past pupil, Philip Lee, became Ireland's first-ever European Champion in Fencing. Hockey is the latest sport to be played in St. Conleth's. The Minor Girls Hockey team played their first game on a full pitch in October 2018 and 5 months later they beat Loreto Beaufort in the final having seen off Dundalk Grammar in the semi final and Mount Anville in the quarter finals.
Debating
St. Conleth's debating tradition is recorded in the minutes of the school's Literary and Debating Society dating back to the 1940s. The 2000s saw St Conleth's win four Irish World's Schools representatives followed by victories in the Trinity College Schools Mace and the University College Dublin School's Mace. In 2010, St. Conleth's began hosting an annual Junior Mace Debating competition. In 2014 there were three Conlethians representing Team Ireland at the World Schools Debating Championship in Bangkok, Thailand. In 2019, St. Conleth's had two winners in the grand final of the Irish Times Debate with Kevin Roche winning the individual competition and Daniel Gilligan won the team competition. Another past pupil, Conor White, was a losing finalist.
Past Pupils' Union
St.Conleth's Past Pupils' Union has been active for over 70 years and very year holds a dinner, a black tie event the school on the last Friday of February or the first Friday of March.
