Saint Mary's College (Irish: Coláiste Mhuire) is a secondary school located in Mullingar, County Westmeath, Ireland. As the town's oldest post-primary school, it officially opened its doors to students on October 22, 1856. It is a voluntary Catholic secondary school based partly in the Hevey Institute and built-on extensions. The school is a member of the Edmund Rice Schools Trust. It is primarily a boys' school, and has been since the day it opened, however, the repeat Leaving Certificate class is co-educational.