| Ontario Open | |
| Location: | Ontario, Canada |
| Establishment: | 1923 |
| Course: | Woodington Lake GC |
| Tour: | Canadian Tour |
| Format: | Stroke play |
| Purse: | C$200,000 |
| Month Played: | July |
| Current Champion: |  Noah Goodwin |
The Ontario Open is a golf tournament on the PGA Tour Canada that is held in Ontario, Canada.
It was founded in 1923 and held every year through 1979, when the Peter Jackson Tour ended. After a long hiatus, an attempted revival in 1989 lasted only one year[1] before the tournament returned for a five year run from 1992 to 1996, during which it was sponsored by the town of Newmarket, Ontario in the first year and then by Export "A" cigarettes.[2] Another lengthy hiatus followed until the tournament returned as a non-tour event in 2019.[3] The following year, it rejoined the tour schedule.
Through 1947 the Ontario Open was a simple 36-hole medal. Except for a three year span from 1960 to 1962 when it was a 72-hole event, from 1948 until it was cancelled in 1979 it was a 54-hole event. Except for 2019, it has been played as a 72-hole event every year since its first revival.
| Year | Venue | Winner[4] | Score | Ref | |
|---|---|---|---|---|---|
| Sotheby's International Realty Canada Ontario Open | |||||
| 2022 | Woodington Lake | 267 | |||
| 2020–2021 | No tournament | ||||
| Ontario Open | |||||
| 2019 | Woodington Lake | 208 | |||
| 1997–2018 | No tournament | ||||
| Export "A" Inc. Ontario Open | |||||
| 1996 | St Thomas | 274 (−10) | |||
| 1995 | Forest City National | 273 (−15) | |||
| 1994 | Forest City National | 278 (−10) | |||
| 1993 | Bridgewater | 270 (−18) | |||
| Ontario Open | |||||
| 1992 | Glenway | 270 | |||
| 1990 - 91 | No tournament | ||||
| 1989 | Lookout Point | 278 | |||
| 1980 - 88 | No tournament | ||||
| 1979 | 205 | ||||
| 1978 | St Thomas | 212 | |||
| 1977 | Cultan | 201 (−9) | |||
| 1976 | Mount Hope | 203 | |||
| 1975 | Barrie | 210 (−6) | |||
| 1974 | Bayview | 202 (−11) | |||
| 1973 | Islington | 211 (+1) | |||
| 1972 | 213 (+3) | ||||
| 1971 | Weston | 207 (−6) | |||
| 1970 | Cutten | 201 (−9) | |||
| 1969 | St Catherines |  Nick Weslock (am) | 208 | ||
| 1968 | Pine Valley | Gary Cowan (am) | 204 (−9) | ||
| 1967 | Islington | 208 | |||
| 1966 | Cataraqui | Doug Mossop (am) | 209 (−1) | ||
| 1965 | Trafalgar | Nick Weslock (am) | 204 | ||
| 1964 | Islington | Nick Weslock (am) | 208 | ||
| 1963 | Pine Valley | 211 | |||
| 1962 | Beach Grove | Nick Weslock (am) | 277 | ||
| 1961 | Islington | 275 | |||
| 1960 | Cherry Hill | 275 | |||
| 1959 | St Catherines | Nick Weslock (am) | 208 | ||
| 1958 | Cataraqui | 211 | |||
| 1957 | St Catherines | 207 (−6) | |||
| 1956 | Brentford | 207 | |||
| 1955 | Cataraqui | 210 | |||
| 1954 | Cedar Brae | 208 (−2) | |||
| 1953 | Jerry Kesselring (am) | 209 | |||
| 1952 | Jerry Kesselring (am) | 211 | |||
| 1951 | 209 (−4) | ||||
| 1950 | 215 | ||||
| 1949 | Essex | Nick Weslock (am) | 212 | [5] | |
| 1948 | 210 (−3) | ||||
| 1947 | St George's | 142 | |||
| 1946 | Burlington | Nick Wisnock (am) | 134 | ||
| 1945 | Royal York | Phil Farley (am) | 142 | ||
| 1944 | Royal York | 144 | |||
| 1943 | Royal York | 146 | |||
| 1942 | Cedar Brae | Phil Farley (am) | 139 | ||
| 1941 | Hamilton | 138 | |||
| 1940 | Erie Downs | 139 (−5) | |||
| 1939 | Burlington | 141 | |||
| 1938 | Summit | 140 | |||
| 1937 | 139 | [6] | |||
| 1936 | 144 | [7] | |||
| 1935 | Scarboro | 145 | [8] | ||
| 1934 | 143 | [9] | |||
| 1933 | Toronto | 146 | [10] | ||
| 1932 | 137 | [11] | |||
| 1931 | Summit | 144 | [12] | ||
| 1930 | Toronto | 151 | [13] | ||
| 1929 | Lakeview | 148 | [14] | ||
| 1928 | Hamilton | 142 | [15] | ||
| 1927 | Rosedale | 150 | [16] | ||
| 1926 | York Downs | 146 | [17] | ||
| 1925 | Summit | 144 | [18] | ||
| 1924 | Toronto | 152 | [19] | ||
| 1923 | Lakeview | 153 | [20] | ||