Mary Ward Catholic Secondary School (abbreviated Mary Ward C.S.S., MWCSS, MW, Mary Ward, or simply Ward) is a Catholic secondary school in Toronto, Ontario, Canada. It is administered by the Toronto Catholic District School Board, formerly the Metropolitan Separate School Board. Mary Ward is a centre of self-directed learning and a member of the Canadian Coalition of Self-Directed Learning. It is one of only two self-directed learning schools currently in Ontario and seven in Canada.

The school was founded in 1985 as a conventional high school between two campuses in northeast Toronto until it moved into a new building at Kennedy Rd. and McNicoll Ave., designed specifically for its self-directed learning program (formerly called Direction 2000) in January 1992. The school is named after Mary Ward, a seventeenth-century English Catholic nun who founded the Sisters of Loreto.