François Lesieur Desaulniers (1785 – August 7, 1870) was a Quebec farmer and political figure.

In 1805, he married Charlotte, the daughter of Augustin Rivard, who represented Saint-Maurice in the legislative assembly from 1792 to 1796.

Desaulniers was elected to the Legislative Assembly of Lower Canada for Saint-Maurice in an 1836 by-election as a member of the parti patriote.

His son Louis-Léon was a member of the Canadian House of Commons.

This article about a Member of the National Assembly of Quebec is a stub.