| Sinclair Secondary School | |
| Address: | 380 Taunton Road East |
| City: | Whitby |
| Province: | Ontario |
| Postcode: | L1R 2K5 |
| Country: | Canada |
| Coordinates: | 43.9198°N -78.9413°W |
| Schooltype: | Public |
| Motto: | "A Reputation of Excellence" |
| Founded: | 1994 |
| Schoolboard: | Durham District School Board |
| Principal: | Alison Evanoff |
| Grades Label: | Grades |
| Grades: | 9-12 (13 in Special Cases) |
| Enrolment: | 1,000[1] |
| Enrolment As Of: | 2020/2021 |
| Language: | English, French |
| Colours: | Green and blue |
| Mascot: | Celtics |
Sinclair Secondary School is located in Whitby, Ontario and opened in 1994. Serving Special Education students, the school is recognized for its strong academic reputation and remains the highest ranked school in the Durham Region, according to the Fraser Institute's Ontario Secondary School Report Card program.[2]