James William Dunn (February 25, 1931 – January 6, 1999) — also known as Bill Dunn — was an American professional baseball player, a right-handed pitcher who worked in three Major League games, all in relief, for the 1952 Pittsburgh Pirates. Dunn stood 6 feet (1.8 m) tall and weighed 185 pounds (84 kg). He graduated from Gadsden, Alabama, High School in 1949 and attended the University of Alabama. He spent the rest of his career in minor league baseball, winning 15 games for the Class C Billings Mustangs in 1955 in his finest season.