| Roles | Competed in Olympic Games |
|---|---|
| Sex | Female |
| Full name | Mary Beth Pauline•Stewart (-McIlwaine) |
| Used name | Mary Beth•Stewart |
| Born | 8 December 1945 in Vancouver, British Columbia (CAN) |
| Measurements | 154 cm / 44 kg |
| NOC | Canada |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1960 Summer Olympics | Swimming (Aquatics) | CAN |
Mary Beth Stewart | |||
| 100 metres Freestyle, Women (Olympic) | 8 | |||||
| 4 × 100 metres Medley Relay, Women (Olympic) | Canada | 9 | ||||
| 1964 Summer Olympics | Swimming (Aquatics) | CAN |
Mary Beth Stewart | |||
| 100 metres Freestyle, Women (Olympic) | 28 | |||||
| 4 × 100 metres Freestyle Relay, Women (Olympic) | Canada | 7 | ||||
| 100 metres Butterfly, Women (Olympic) | 8 | |||||
| 4 × 100 metres Medley Relay, Women (Olympic) | Canada | 6 |