| St. Mary's Catholic School | |
| Address: | 104 St. Mary's Street NW |
| City: | Sleepy Eye |
| State: | Minnesota |
| Zipcode: | 56085 |
| Country: | United States |
| District: | Public School District # 84 |
| Religious Affiliation: | Roman Catholic |
| Oversight: | St. Mary's Help of Christians Catholic Church parish |
| Superintendent: | Msgr. Eugene Lozinski |
| Founder: | Sisters of St. Francis of Rochester, MN |
| Principal: | Mary Gangelhoff, PreK-6; Peter Roufs, 7-12 |
| Chaplain: | Msgr. Eugene Lozinski |
| Staff: | 15 |
| Faculty: | 25 |
| Test Name: | NWEA / ACRE |
| Average Class Size: | 18 |
| Established: | 1914 / Grade School est. 1883 |
| Type: | Private, Coeducational |
| Tuition: | less than 5k |
| Endowment: | supported by the local parish |
| Grades: | 9–12 |
| Hours In Day: | 8:00a-3:15p |
| Athletics Conference: | Tomahawk |
| Slogan: | Forming Faithful Disciples |
| Fight Song: | Washington & Lee Swing |
| Accreditation: | MNSAA |
| Mascot: | Knights |
| Patron: | St. Mary, Help of Christians |
| Team Name: | Knights |
| Colors: | Green and Gold |
| Enrollment: | 300 |
St. Mary's School is a private, Roman Catholic school in Sleepy Eye, Minnesota. It is located in the Roman Catholic Diocese of New Ulm.
St. Mary's School was established in 1883. The High School was established in 1914
St. Mary's High School is a part of the Tomahawk Conference.
| Sport | Section Championships | State Championships | |
|---|---|---|---|
| Football | 1979, 1988, 2011 | - | |
| Volleyball | - | - | |
| Boys' Basketball | 1998, 2005, 2006 | -2021,2022 | |
| Girls' Basketball | 1999, 2005 | - | |
| Baseball | 1979, 1980, 2001, 2002, 2003, 2004, 2006, 2007 | 2002, 2004, 2006, 2007 | |
| Softball | 1981, 1982, 1983, 1984, 2007 | 1984 |