La Du (April 27, 1876 Van Buren, Onondaga County, New York – August 17, 1954) was an American civil engineer and politician from New York.
He was Division Engineer of the Eastern Division of the State Canals under John A. Bensel, and in 1914 was appointed Special Deputy State Engineer, a post he retained under Frank M. Williams.
He resigned in the fall of 1918, and ran for State Engineer and Surveyor on the Democratic ticket in November 1918, but was defeated by Williams.
In 1922, he ran again, and was elected, being in office from 1923 to 1924, but was defeated again for re-election in 1924 by Republican Roy G. Finch.
He died on August 17, 1954, in Albany, New York.