Léandre Dumouchel (29 March 1811 – September 24, 1882) was a Quebec medical doctor and political figure.

Dumouchel took part in the Lower Canada Rebellion but was not arrested, although he was removed from his position as a justice of the peace.

He took refuge until an amnesty was announced and then returned to his practice at Saint-Benoît, later moving to Saint-Jérôme in the 1840s.

He served as lieutenant-colonel in the local militia from 1847 to 1869 and was president of the agricultural society for Deux-Montagnes County.

He was elected to the Legislative Council of the Province of Canada in 1864 and served until Confederation, when he was named to the Senate.