Onésime Gagnon, Canadian scholar and politician, 20th Lieutenant Governor of Quebec (died 1961)

Onésime Gagnon was a Canadian politician who served as the 20th Lieutenant Governor of Québec.

The lieutenant governor of Quebec is the representative in Quebec of the monarch, who operates distinctly within the province but is also shared equally with the ten other jurisdictions of Canada. The lieutenant governor of Quebec is appointed in the same manner as the other provincial viceroys in Canada and is similarly tasked with carrying out most of the monarch's constitutional and ceremonial duties. The present and 30th lieutenant governor of Quebec is Manon Jeannotte, who has served in the role since January 25, 2024.