Bill Crothers Secondary School

Bill Crothers Secondary School is an athletic based high school in the community of Unionville in Markham, Ontario, Canada. It was the newest secondary school in the York Region District School Board for a number of years, since 2008. Named for the former Olympic athlete and Chair of the York Region District School Board, Bill Crothers, the school opened its doors to Grade 9 and 10 students in August 2008. The school is 32 acre and cost an estimated $32 million to build. The school was formerly an 18-hole golf course, Unionville Golf Centre, opened in 1961.

Notable alumni

 * Bianca Andreescu, Canadian tennis player, winner of 2019 US Open
 * Andrew Coe, professional rugby player
 * Carol Zhao, Chinese-Canadian tennis player
 * Trae Bell-Haynes, basketball player
 * Joseph Blandisi, AHL ice hockey player
 * Anthony Cirelli, ice hockey player for the Tampa Bay Lightning
 * Travis Dermott, ice hockey player for the Utah Hockey Club
 * Morgan Frost, NHL ice hockey player for the Philadelphia Flyers
 * Steven Furlano, Canadian soccer player
 * Marc Liegghio, Canadian football kicker and punter for the Hamilton Wildcats
 * Stephen Maar, Canadian volleyball player
 * Mariah Madigan, retired trampoline gymnast
 * Emanuel Miller, Canadian college basketball player
 * Leonard Miller, Canadian basketball player in the Minnesota Timberwolves Organization
 * Roman Sadovsky, Canadian figure skater and YouTuber
 * Alain Sargeant, Canadian soccer player
 * Breanne Wilson-Bennett, ice hockey player
 * David Mackie, Canadian football player for the BC Lions
 * Zachary Gingras, Canadian paralympic athlete