William Oscar Smith (May 2, 1917 – May 31, 1991), was a jazz double bassist and music educator. Although he never pursued a solo career, and, as a result, is not often remembered by jazz historians, Smith was an important player in early jazz history as a sideman. Most notably, Smith was the bassist on Coleman Hawkins' iconic 1939 recording of "Body and Soul". The great jazz trumpeter Dizzy Gillespie said of Smith, "Of all the musicians I've had the pleasure of associating with, I can say that Oscar Smith was among the most gifted. His timing and resolution were almost perfect. He helped me discover my own sense of harmony and rhythm." Gillespie describes him as a sideman extraordinaire.