William Warren Lynch (September 30, 1845 – November 23, 1916) was a Canadian lawyer, politician, and judge in the province of Quebec.

Born near the Village of Bedford, County of Missisquoi, Canada East, the son of Thomas Lynch of County Cavan and Charlotte R. Williams, Lynch attended Stanbridge Academy and entered the University of Vermont in 1861 but did not continue his studies there due to the American Civil War.

In 1862, he received a scholarship from McGill University and entered the Arts course but due to his poor health he was unable to complete his studies.

During the Fenian raids of 1866 Lynch took an active part in the formation of a company of volunteers at Brome, of which he became lieutenant, and remained such until his resignation in 1871.

In 1871, he was acclaimed to the Legislative Assembly of Quebec for the electoral district of Brome and moved to Knowlton.