William Robert Warnock (born August 29, 1838) was a Republican member of the United States House of Representatives from Ohio. He represented Ohio’s 8th Congressional District and served as a historical member of Congress in the early twentieth century. His service in the U.S. House is documented under the Biographical Directory of the United States Congress identifier W000161.

Warnock served two terms in Congress, holding office from December 2, 1901, to March 3, 1905. During this period, he served as a Representative from Ohio, aligned with the Republican Party. His tenure covered the 8th District, and he is recorded as a former officeholder, with no additional committee assignments, official contact details, or other roles specified in the available metadata.