| Mary Stewart | |
| Fullname: | Mary Pauline Stewart |
| National Team: | Canada |
| Strokes: | Butterfly, freestyle |
| Birth Date: | December 8, 1945 |
| Birth Place: | Vancouver, British Columbia |
| Height: | 1.54m (05.05feet) |
| Weight: | 44kg (97lb) |
| Show-Medals: | yes |
Mary Pauline Stewart (born December 8, 1945), also known by her married name Mary Stewart McIlwaine, is a Canadian former competitive swimmer.
Stewart twice broke the world record in the women's 100-metre butterfly in the early 1960s. Stewart also competed in freestyle events as a member of the Canadian national team in major international championships.
As a 14-year-old, she represented Canada in the 1960 Summer Olympics in Rome, where she finished eighth in the women's 100-metre freestyle, and also competed in the preliminary hears of the women's 4x100-metre medley relay event. Two years later at the 1962 Commonwealth Games in Perth, Western Australia, she won the gold medal in the women's 100-metre butterfly. At the 1963 Pan American Games in São Paulo, Brazil, Stewart enjoyed a four-medal performance, garnering silver medals for her second-place performances in the 100-metre freestyle, 100-metre butterfly, 4x100-metre freestyle relay, and the 4x100-metre medley relay.
Despite being of Canadian nationality, she won the ASA National British Championships over 110 yards butterfly 1963.[1]
In her final international appearance at the 1964 Summer Olympics in Tokyo, she finished eighth in the 100-metre butterfly, and also competed as a member of the Canadian teams in the 4x100-metre freestyle and 4x100-metre medley relay events.
She is the sister of Helen Stewart.