Nicolas Saint-Martin (August 10, 1753 – July 12, 1823) was a militia officer and political figure in Lower Canada.
He was born Jacques-Nicolas Saint-Martin at Trois-Rivières in 1753, the son of a captain in the French navy who took part in the defence of Quebec City.
In 1784, he married Marie-Louise, the daughter of seigneur Louis-Joseph Godefroy de Tonnancour.
He was named justice of the peace for the Trois-Rivières district in 1790 and was also served as commissioner for various public works projects in the region.
Saint-Martin joined the local militia, becoming lieutenant-colonel in 1812, and served during the War of 1812.