| William Waller Rucker | |
| State: | Missouri |
| Term Start: | March 4, 1899 |
| Term End: | March 3, 1923 |
| Predecessor: | Robert N. Bodine |
| Successor: | Ralph F. Lozier |
| Birth Name: | William Waller Rucker |
| Birth Date: | 1 February 1855 |
| Birth Place: | near Covington, Virginia, U.S. |
| Death Place: | Keytesville, Missouri, U.S. |
| Spouse: | Fannie Applegate Rucker |
| Relations: | Edgar P. Rucker (brother)(cousin). = Atterson Rucker |
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.
Rucker was elected as a Democrat to the Fifty-sixth and to the eleven succeeding Congresses (March 4, 1899 - March 3, 1923). He served as chairman of the Committee on Election of President, Vice President, and Representatives (Sixty-second through Sixty-fifth Congresses). After losing the reelection in 1922 to the Sixty-eighth Congress, he resumed the practice of law in Keytesville, Missouri. He also engaged in agricultural pursuits.
Rucker died in Keytesville, Missouri, on May 30, 1936. He was interred in the City Cemetery.