Secondary School

Castleknock College

Castleknock, Dublin
DEIS Boys

School Details

Address
College Rd, Castleknock
Location
Castleknock, Dublin
School Type
Secondary
Total Enrollment (2025/26)
771 students
Enrollment Split
771 Boys
Ethos
Catholic
Irish Classification
No subjects taught through Irish
Gender
Boys
Roll Number
60100Q
Latest Inspection Reports
View on gov.ie

Location

About

St Vincent’s Castleknock College is a voluntary Catholic secondary school for boys, rooted in the Vincentian tradition and guided by a Christian ethos that prioritises faith, respect, care for the vulnerable and the development of self‑worth through active participation. The college prides itself on academic excellence, with recent rankings placing it joint first among Irish schools and a 100 % progression rate of graduates to third‑level education. Learning is centred on active, student‑led inquiry within the classroom, complemented by a strong emphasis on co‑curricular achievement, particularly in rugby and a broad range of sports. Set on 70 acres just nine kilometres from Dublin city centre, the campus boasts extensive facilities: ten rugby pitches, five flood‑lit savannah‑style tennis courts (also used for soccer and handball), a running track, a table‑tennis centre, a soccer pitch, a cricket crease and a flood‑lit all‑weather 4G pitch under construction. Cultural and intellectual enrichment is supported by debating societies, a chess club, an orchestra, several college bands, choirs, computer and programming classes, a museum, an art gallery, a substantial library and even Chinese language and culture lessons. A comprehensive pastoral framework—including prefects, a buddy system, class tutors, year heads, a guidance counsellor, a chaplain and a learning support team—ensures each student’s wellbeing, while an active Parent Representative Association and Student Council give families a voice in school life.

History

The college traces its origins to 1830, when four Maynooth priests opened a day school at 24 Usher’s Quay following Catholic Emancipation. In October 1834 Fr John McCann purchased land at Castleknock to establish a seminary, and on 28 August 1835 St Vincent’s Ecclesiastical Seminary opened under its first President, the Very Rev Philip Dowley. The inaugural enrolment was one hundred boys, who studied humanities, rhetoric, logic, natural philosophy and theology. Between 1836 and 1861, 635 students graduated, with 147 entering religious life, including future bishops and archbishops. Over the ensuing centuries the college expanded its buildings and modernised its facilities, becoming a fully equipped day school. In 1987 day students were admitted for the first time, and in June 2006 the final boarders left, with former boarding houses converted into additional classrooms.