Nicolas-Eustache Lambert Dumont (September 25, 1767 – April 25, 1835) was a seigneur, judge and political figure in Lower Canada.
In 1804, he was elected to the Legislative Assembly of Lower Canada for York County; he was reelected in 1814 and served until 1827.
In 1810, he established a settlement on the Du Nord River which later became Saint-Jérôme.
Lambert Dumont was apparently qualified as an engineer and surveyor and is believed to have constructed several bridges in the region.
In 1821, he was named judge for the trial of small causes in York County.