Ontario U-21 Curling Championships
The Ontario U-21 Curling Championships is an annual curling tournament. It is the provincial curling championship for curling teams aged 20 and under in Southern Ontario. The winning team represents Ontario at the Canadian Junior Curling Championships.
Men's winners
Until 1978, the event was known as the provincial schoolboy championship. Since 1979, there have been two separate events.| Year | Skip | Club |
| 1950 | Glen Sagle | Sault Ste. Marie Collegiate Institute |
| 1951 | Mike Cassels | Hamilton Westdale Collegiate |
| 1952 | Jack Mosley | Lindsay Collegiate |
| 1953 | Bob Walker | Oshawa Collegiate Institute |
| 1954 | Bill Fraser | Sarnia Collegiate Institute |
| 1955 | Bill Fraser | Sarnia Collegiate Institute |
| 1956 | Bill Fraser | Sarnia Collegiate Institute |
| 1957 | Ian Johnston | Kingston Collegiate and Vocational Institute |
| 1958 | Gordon Stibbards | Welland High & Vocational |
| 1959 | Irwin Wallace | Parry Sound Curling Club |
| 1960 | Bob Estall | Kingston Collegiate and Vocational Institute |
| 1961 | Ron Bobbie | Kitchener-Waterloo CVS |
| 1962 | Wally Smith | Banting Memorial High School |
| 1963 | Jerry Blair | West Hill Secondary |
| 1964 | John Harris | Owen Sound Collegiate |
| 1965 | Paul Savage | Don Mills Collegiate |
| 1966 | Mike Boyd | Kingston Collegiate |
| 1967 | Barry Timbers | Uxbridge Secondary School |
| 1968 | Bill Hope | Trenton High School |
| 1969 | George Cox | Renfrew District Collegiate Institute |
| 1970 | Fred Osburn | J.F. Ross Collegiate and Vocational Institute |
| 1971 | Mark McDonald | Gananoque Secondary School |
| 1972 | Mark McDonald | Gananoque Secondary School |
| 1973 | Mark McDonald | Gananoque Secondary School |
| 1974 | Peter File | Brampton Centennial Secondary |
| 1975 | Dave Velanoff | London Westminster Secondary |
| 1976 | Ken Pearce | Victoria Park Secondary |
| 1977 | Barry Acton | Uxbridge Secondary School |
| 1978 | Daryl Shane | Hanover John Diefenbaker Secondary |
| 1979 | Nick Rizzo | Brant Curling Club |
| 1980 | John Kawaja | St. George's Golf and Country Club |
| 1981 | John Base | Oakville Curling Club |
| 1982 | John Base | Mississaugua Golf & Country Club |
| 1983 | Daniel Lachance | Rockcliffe Curling Club |
| 1984 | Steve Hartley | Thornhill Country Club |
| 1985 | Fred Hackel | London Curling Club |
| 1986 | Mike Harris | Tam Heather Curling Club |
| 1987 | Wayne Middaugh | Brampton Curling Club |
| 1988 | Daryl Morrell | Morrisburg Curling Club |
| 1989 | Dave Allan | Kingston Curling Club |
| 1990 | Noel Herron | Kingston Curling Club |
| 1991 | Peter Steski | Forest Curling Club |
| 1992 | Adam Spencer | Guelph Curling Club |
| 1993 | Joe Frans | St. Catharines Golf and Country Club |
| 1994 | Joe Frans | Bradford and District Curling Club |
| 1995 | Patrick Ferris | Peterborough Curling Club |
| 1996 | Patrick Ferris | Sutton Curling Club |
| 1997 | John Morris | Ottawa Curling Club |
| 1998 | John Morris | Ottawa Curling Club |
| 1999 | John Morris | Ottawa Curling Club |
| 2000 | Jason Young | Burlington Curling Club |
| 2001 | Bobby Reid | High Park Club |
| 2002 | Jeff Armstrong | Blue Water Curling Club |
| 2003 | Mark Bice | Sarnia Golf and Curling Club |
| 2004 | John Epping | Granite Club |
| 2005 | Mark Bice | Sarnia Golf and Curling Club |
| 2006 | Codey Maus | Dixie Curling Club |
| 2007 | Ryan Myler | Brampton Curling Club |
| 2008 | Travis Fanset | St. Thomas Curling Club |
| 2009 | Bowie Abbis-Mills | Kitchener-Waterloo Granite Club |
| 2010 | Jake Walker | Westmount Golf and Country Club |
| 2011 | Mathew Camm | Ottawa Curling Club |
| 2012 | Brett Dekoning | Omemee Curling Club |
| 2013 | Aaron Squires | St. Thomas Curling Club |
| 2014 | Ryan McCrady | Rideau Curling Club |
| 2015 | Mac Calwell | Quinte Curling Club |
| 2016 | Doug Kee | Navan Curling Club |
| 2017 | Matthew Hall | Westmount Golf and Country Club |
| 2018 | Matthew Hall | Westmount Golf and Country Club |
| 2019 | Samuel Steep | Galt Country Club |
| 2020 | Owen Purdy | Cataraqui Golf & Country Club |