William 'Daddy' Byrd (July 15, 1907 – January 4, 1991) was an American professional baseball player in the Negro leagues. Born in Canton, Georgia, he was a right-handed pitcher. He participated in six All-Star games. Byrd also saw action with the Criollos de Caguas and Cangrejeros de Santurce clubs of the Puerto Rico Winter League, where he was considered one of the best hurlers. He died at age 83 in Philadelphia, Pennsylvania.
- The ESPN Baseball Encyclopedia. Ballantine Books. 2007. p. 1698. ISBN 1-4027-4771-3.
- Negro league baseball statistics and player information from Baseball-Reference (Negro leagues)
- Negro League Baseball Museum