| J. Willis Ambrose | |
| Birth Name: | John Willis Ambrose |
| Birth Place: | Pincher Creek, Canada |
| Death Place: | Kingston, Ontario, Canada |
| Fields: | Geology |
| Workplaces: | Queen's University at Kingston |
| Alma Mater: | Stanford University Yale University |
John Willis Ambrose Ph.D. (19041974) was the first President of the Geological Association of Canada in 1947.
Ambrose grew up in southwestern Alberta.
Ambrose obtained a B.A. from Stanford University in 1932 and a Ph.D. from Yale University in 1935.
Ambrose spent his career exploring geology in Canada. Between 1945 and 1948, he lived in Toronto, but was a Special Lecturer at Queen's University in Kingston, Ontario. In 1948, he moved to Kingston and joined Queen's full-time. He served as head of their geology department from 1962 until 1968. Ambrose retired in 1973.
The Geological Association of Canada honours Ambrose annually by awarding the Ambrose Medal to an individual for sustained dedicated service to the Canadian earth science community.