St. Cronan's is an active participant in Gaelic games. The school has both Gaelic Football and Hurling teams which compete against the other schools in the Wicklow area. Both teams have been very successful in recent years. The school's Gaelic Football team have been County Champions many times, and have also been victorious in the Coughlin Cup.
The school's team colours are blue, yellow, and white to match the school's uniform. In the past, the school's colours were red and white; which matched the colours of the school uniform at the time.
The school has close ties with Bray Emmetts GAA Club, and many of the children in the school are also members of the club. St. Cronan's GAA jerseys are sponsored by a local charitable organisation, the Bray Lions Club. The boys in the school participate in many of the community projects organised by this club.