| Wyndham St. John | |
| Nationality: | Canadian |
| Sport: | Equestrian |
| Birth Date: | 30 May 1959 |
| Birth Place: | Vancouver, British Columbia, Canada |
| Death Place: | Andalucia, Spain |
Wyndham St. John (30 May 1959 – 6 March 2023) was a Canadian equestrian. She competed in the individual eventing at the 2000 Summer Olympics.[1]
St. John died in Andalucia, Spain on 6 March 2023, at the age of 63.[2]