Amos Leon Thomas Jr (born 1937, died May 8, 1999) was an American avant garde jazz singer from East St. Louis, Illinois. He changed his name to Leone in 1974.

Thomas is best known for his work with Pharoah Sanders, particularly the 1969 song "The Creator Has a Master Plan" from Sanders' Karma album. Thomas's most distinctive device was that he often broke out into yodeling in the middle of a vocal. This style has influenced singers James Moody and Tim Buckley,among others.

Thomas studied music at Tennessee State University. He also worked with Grant Green, Jimmy Forrest, and Hank Crawford, Count Basie, Mary Lou Williams, Randy Weston, Rahsaan Roland Kirk, Louis Armstrong, Carlos Santana, Freddie Hubbard and Oliver Nelson.

Thomas died of heart failure on May 8, 1999.

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