Alexander McClay Williams (July 23, 1914 – June 8, 1931) was an African-American teenager wrongfully convicted and executed for the 1930 murder of 33-year-old Vida Robare, a matron of the Glen Mills reform school he attended, in Pennsylvania. Williams confessed to the murder, although he later recanted his confession. The Commonwealth of Pennsylvania wrongfully executed Williams for Robare's murder in 1931 when he was 16 years old, making Williams the youngest person ever executed in Pennsylvania.