Wilbur W. Marsh (July 14, 1862 - December 23, 1929), was treasurer of the Democratic National Committee.
He was born in New York on July 14, 1862. He was a Democratic National Committeeman in 1912 and again in 1916. He was the committee's treasurer from 1916 to 1924.
He was a delegate to 1920 Democratic National Convention and the 1928 Democratic National Convention representing Iowa.
Marsh died at his home in Waterloo, Iowa, on December 23, 1929, after having a stroke while driving his car.