Dwight Leroy Siebler (August 5, 1937 – June 16, 2021) was an American professional baseball player. A right-handed pitcher who attended the University of Nebraska-Lincoln, he spent one full season (1966) and parts of four others in Major League Baseball for the Minnesota Twins. Siebler stood 6 feet 2 inches (1.88 m) tall and weighed 184 pounds (83 kg). Siebler appeared in 48 Major League games pitched. In 1171⁄3 innings, he allowed only 97 hits, with 71 strikeouts and 44 bases on balls. He left professional baseball after the 1967 season.