St Mary's College is a Catholic primary and secondary school located in Seymour, Victoria, Australia, catering for students from F to Year 11 and Year 12 in 2025. Established as St. Mary’s Convent School in 1900 by the Sisters of Mercy, the school went through a series of name changes from Sacred Heart College, and changes of site. In 1988 St. Mary’s Primary School and Sacred Heart College were amalgamated and became St. Mary’s College.