Samuel McCallum Genest (June 10, 1865 – June 25, 1937) was a Canadian politician and civil servant.
He is known for his defence of francophone rights in Ottawa and Ontario.
Born in Trois-Rivières, Canada East, he was the son of Laurent-Ubald Genest, a lawyer who was for many years Clerk of the Peace to Trois-Rivières, and Marie-Charlotte-Emma McCallum, who was born in Montreal.