Montpetit is a French Canadian surname. Notable people with the surname include:
Alain Montpetit (1950–1987), Canadian television and radio personality in Quebec Camille Montpetit, Canadian civil servant Édouard Montpetit (1881–1954), Canadian lawyer, economist and academic from Quebec Jacqueline Montpetit, Canadian politician from Quebec Marie Montpetit (born 1979), Canadian politician from Quebec Pascale Montpetit (born 1960), Canadian actress Richard Montpetit (born 1939), Canadian gymnast Sara Montpetit, Canadian actress and environmental activist from Quebec