Dr. John M. Denison Secondary School

Dr. J.M. Denison S.S. is a public high school in the York Region District School Board located on 135 Bristol Road, Newmarket, Ontario, Canada. It opened in 1989, additions were built in 1991, and a new technological studies wing was completed in late 2009. The school is just south of the border between Newmarket and East Gwillimbury.

Dr. J.M. Denison S.S. is named after John Michael Denison (1933–2001), a family physician and former coroner for York Region. Denison was a witty and ambitious doctor who was much loved and respected in and around Newmarket. His generosity and outstanding work with teenagers inspired the community to name the school after him, an honour seldom bestowed on a living person.