St. Leo may refer to one of several saints named Leo, or:
Places
Australia
- St Leo's Catholic College, Sydney
- St Leo's College, University of Queensland, Brisbane
Canada
Ireland
United States
Schools
- Saint Leo University, St Leo, Florida
- St. Leo the Great School, Oakland, California
- St. Leo the Great School, San Jose, California
- St.Leo's Parish School, Elmwood Park, New Jersey
- St. Leo Catholic School, Winston-Salem, North Carolina
- St. Leo Primary School, KwaZulu-Natal Province, South Africa
Churches named St. Leo
- Saint Leo the Great Parish, within the Roman Catholic Diocese of San Jose, California
- St.Leo's Roman Catholic Church, Elmwood Park, New Jersey
- Chapel of St Leo, Żurrieq, Malta
Other
- St. Leo's (soccer team), an early twentieth century American soccer team
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