| St. Marcellinus Secondary School | |
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| Address | |
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730 Courtneypark Drive West. , , Canada | |
| Coordinates | 43°37′25″N 79°42′37″W / 43.62367°N 79.7102°W |
| Information | |
| School type | Provincial, Catholic Secondary School |
| Motto | Let Every Spirit Soar |
| Religious affiliation(s) | Roman Catholic |
| Founded | 2003 |
| School board | Dufferin-Peel Catholic District School Board |
| Superintendent | Adrian Scigliano |
| Area trustee | Thomas Thomas Luz del Rosario |
| School number | 821381 |
| Principal | Maria Bueno |
| Grades | 9 to 12 |
| Enrolment | 1838 (As of October 31, 2015)[1] |
| Language | English, programs include French |
| Campus | Suburban |
| Area | Mississauga Central |
| Colour(s) | red, black |
| Team name | St. Marcellinus Spirit |
| Website | www |
St. Marcellinus Secondary School (commonly referred to as Marcies) is a Catholic high school located in Mississauga, Ontario.