Séverin Dumais (February 10, 1840 – April 28, 1907) was a notary and political figure in Quebec.
He represented Chicoutimi-Saguenay in the Legislative Assembly of Quebec from 1888 to 1890 as a Parti National member.
He was born in Saint-Georges-de-Cacouna, Lower Canada, the son of Paschal Dumais and Éléonore Couillard, and was educated at Sainte-Anne-de-la-Pocatière.
Dumais ran unsuccessfully for a seat in the Quebec assembly in 1886, losing to Élie Saint-Hilaire.
He was elected to the assembly in an 1888 by-election held after Saint-Hilaire's death and was defeated when he ran for reelection in 1890.