William Augustin Webb (1824-1881) was an American sailor and Mexican–American War veteran who resigned his United States Navy commission after more than 20 years of service to join the Confederate States Navy in the American Civil War. Webb was decorated for his service as Captain of the CSS Teaser, part of the James River Squadron, during the Battle of Hampton Roads (1862).

CSS Teaser had been the aging Georgetown, D.C. tugboat York River until the beginning of the American Civil War, when she was taken into the Confederate States Navy and took part in the famous Battle of Hampton Roads. Later, she was captured by the United States Navy and became the first USS Teaser.