St. Colman's High and Sixth Form College is an 11–18 Roman Catholic co-educational secondary school situated in Ballynahinch, County Down, Northern Ireland. The schools catchment area includes Ballynahinch Crossgar, Dromara, Downpatrick, Castlewellan, Loughinisland, Lisburn and Belfast. As of 2025, the school had a total of 550 pupils enrolled, and consistently ranks amongst the top 20 non-selective schools across the South Eastern Education Authority for academic attainment.