St. Mary's School may refer to one of many schools across the world:

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United Kingdom

• St Mary's School, Banbury, Oxfordshire
• St Mary's School (Calne), Wiltshire, an independent day and boarding school
• St Mary's C of E Primary School, South Shields
• St Mary's Shaftesbury, a Catholic girl's boarding and day public school in Dorset
• St Mary's Roman Catholic High School, Chesterfield, a Roman Catholic, Voluntary Aided, comprehensive secondary school in Newbold, Chesterfield
• St Marys CBGS Belfast, Belfast
• St. Mary's Roman Catholic School, Sunderland Reception, Infant and Junior school in the city of Sunderland, England

United States of America

• St. Mary-Basha Catholic School (Pheonix, Arizona), a Catholic elementary school
• St. Mary's School (Boise, Idaho), a Catholic elementary school
• St. Mary's School (Storm Lake, Iowa), PreK-12
• Saint Mary School, Bordentown, New Jersey
• Saint Mary's School (Raleigh, North Carolina), the first school in North Carolina
• School of St. Mary (Lake Forest, Illinois), an independent elementary and middle school
• St. Mary's School (Memphis, Tennessee) is an Episcopal school for girls founded in 1847
• St. Mary's Catholic School (Temple, Texas), a Roman Catholic elementary and middle school located in Central Texas
• St. Mary's School (Middletown, New Jersey) is the school affiliation of the parish in Middletown, New Jersey
• School of St. Mary (Tulsa, Oklahoma), a Catholic elementary and middle school
• St. Mary's School (Greenville, South Carolina), an elementary and middle school
• St. Mary's Catholic School (Oak Ridge, Tennessee) is a Roman Catholic elementary and middle school located in East Tennessee
• St. Mary's Catholic School, Mansfield, Ohio, a Catholic elementary school
• St. Mary's Catholic School, Mansfield, Massachusetts, a Catholic elementary school

Pakistan

• St. Mary's School (Multan), at Multan, Punjab, Pakistan

India

• St. Mary's Orphanage & Day School, Dum Dum, Kolkata is an orphanage and school run by the Irish Christian Brothers' Association.
• St. Mary's School (I.C.S.E. & S.S.C.), Mazagaon, Mumbai, Maharashtra is a school run by The Society of St. Ignatius of Loyola.
• St. Mary's Convent School Kasauli, Himachal Pradesh is a school run by the Congregation of The Sisters of the Destitute
• S.T. Mary's Senior Secondary School, Sikar, Rajasthan is a school run by Little Flower Congregation. The school is headed by Fr. Varghese Koikara.

Canada

• St. Mary's High School (Calgary), Alberta, originally known as St. Mary's School when it taught grades 1-12.
• St. Mary's School (Medicine Hat, Alberta)
• St Mary's Elementary School (Regina, Saskatchewan), a school that teaches from Grade Pre-K to Grade 8
• St Mary's Academy (Edmundston, New Brunswick), which teaches students from grades Kindergarten to Grade 12

South Africa

• St Mary's School, Waverley

Europe

• St Mary's School, Limassol, Cyprus

Kenya

• St. Mary's School, Nairobi

Malaysia

• St. Mary's School, Kuala Lumpur (locally known as SMK St. Mary). Note that there is another primary school (locally known as SK St. Mary) that bears the same name.
• St. Mary's School, Kuching

Burma

• St. Mary's School Maymyo

See also

• St. Mary's High School (disambiguation)
• Saint Mary's College (disambiguation)
• Saint Mary's University (disambiguation)