Nicolas-Eustache Lambert Dumont (September 25, 1767 – April 25, 1835) was a seigneur, judge and political figure in Lower Canada.
He was born in Trois-Rivières in 1767, the son of the seigneur of Mille-Îles.
He served as a major in the local militia and became lieutenant-colonel in 1807.
He purchased the seigneury of ÃŽle-Ã -la-Fourche and inherited the seigneury of Nicolet from an aunt.
Lambert Dumont's residence was at Saint-Eustache.
In 1800, he was named justice of the peace.
In 1804, he was elected to the Legislative Assembly of Lower Canada for York County; he was reelected in 1814 and served until 1827.
During his time in office, he generally tended to support the British authorities but sometimes supported the Parti canadien when it suited his interests.