St Mary's College is a private Catholic primary and secondary school for girls located in the "square mile" of the city of Adelaide, South Australia.

[2] The Sisters of St Joseph of the Sacred Heart provided primary education for students from the lower socioeconomic status, while the Dominican Sisters took responsibility for middle-class girls from both Catholic and other religious backgrounds whose parents could afford post-primary education.

St Mary's selects Year 11 students to attend pilgrimages annually.

The primary focus of the Pilgrimage is on giving service and working with orphaned, disabled children in the Phu My Orphanage in the Thi Nghe District, Saigon.

The Orphanage is operated by the Sisters of St Paul de Charters, and houses over 300 children.