Joseph Thomas O'Neal Jr. (August 13, 1881 – September 4, 1944) was interim mayor of Louisville, Kentucky, from June to December 1927.
O'Neal's father was a respected Louisville lawyer who ran for mayor in 1905, losing in a rampantly fraudulent election to Paul C. Barth.
Republican Party boss Chesley Searcy discovered in October that Baker had been a member of the Ku Klux Klan as recently as April 1925.
After the Louisville Herald-Post broke the story, O'Neal was appointed the emergency replacement for Baker a week before the election.
Governor William Fields appointed O'Neal to serve the remainder of the term until a November 7 special election.