Williamson Robert Winfield Cobb (June 8, 1807 – November 1, 1864) was an American politician who served the state of Alabama in the U.S. House of Representatives between 1847 and 1861.

Cobb received a limited education and worked as a clock peddler and merchant in Bellefonte before being elected to the Alabama House of Representatives in 1844.

Cobb was reelected to six additional terms, consistently defeating more affluent, better educated opponents from Huntsville, including Clement Claiborne Clay, by the majority vote of the plain folk of the hill country.

Despite owning slaves himself, Cobb ran on an anti-elite platform which garnered support among poor and disenfranchised people.

It charged him with failing to claim his seat in the House, "being behind enemy lines on terms of friendly intercourse", and "manifesting his disloyalty to the Confederate States.