William Waller Rucker (February 1, 1855 – May 30, 1936) was a U.S. Representative from Missouri. Born near Covington, Virginia, Rucker moved with his parents to western Virginia in 1861. He attended the common schools and moved to Chariton County, Missouri, in 1873. He engaged in teaching in the district schools and eventually studied law. In 1876, he got admitted into the bar and commenced practice in Keytesville, Missouri. He served as prosecuting attorney of Chariton County from 1886–1892. and then served as judge of the twelfth circuit in 1892–1899.