William Elijah Cox (September 6, 1861 – March 11, 1942) was an American lawyer and politician who served six terms as a U.S. Representative from Indiana from 1907 to 1919.

He served as prosecuting attorney for the eleventh judicial district of Indiana 1892-1898.

He served as chairman of the Committee on Expenditures in the Department of the Treasury (Sixty-second Congress).

He resumed the practice of law and also was engaged with a desk-manufacturing company, serving as president at the time of his death.

This article incorporates public domain material from the Biographical Directory of the United States Congress