The Alabama Centennial half dollar, or Alabama half dollar, was a commemorative fifty-cent coin struck by the United States Bureau of the Mint in 1921 as a belated acknowledgement of the 100th anniversary of Alabama's admission to the Union in 1819. The coin was created by Laura Gardin Fraser, the first woman credited with designing a coin.
Alabama Congressman Lilius Bratton Rainey introduced legislation for a commemorative coin at the request of the state's centennial commission. The bill originally provided for commemorative quarters but was amended to provide for halves instead.