Sinclair Secondary School

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Sinclair Secondary School is a public high school in Whitby, Ontario, Canada. It opened in 1994 and is part of the Durham District School Board. The school serves students in grades 9–12 (with some in grade 13 in special cases) and focuses on supporting students with special education needs. It has about 1,000 students (2020–2021).

Sinclair is known for its strong academics and is the highest-ranked school in the Durham Region according to the Fraser Institute’s Ontario Secondary School Report Card.

The campus is located at 380 Taunton Road East, Whitby, Ontario, L1R 2K5. Instruction is in English and French. The school colors are green and blue, and the Celtics are the mascot. The motto is "A Reputation of Excellence." The principal is David Sasseville.

Notable alumni and faculty:
- Delroy Clarke (faculty, Canadian football player)
- Aaron Milton (alumni, Canadian football player)
- Ana Padurariu (alumni, gymnast, 2018 World Championships silver medalist on beam)
- Karl Svoboda (faculty, former professional rugby player)