Ronald Lee Nischwitz (born July 1, 1937 in Dayton, Ohio) is a former Major League Baseball relief pitcher who played from 1961 to 1963, and again in 1965, for the Detroit Tigers and Cleveland Indians. A switch-hitter, he threw left-handed, was 6 ft 3 in (1.91 m) tall and weighed 205 lb (93 kg). Nischwitz played in only 14 big league games in 1963, going 0–2 with a 6.48 ERA. He did not play in the majors in 1964. Overall, Nischwitz 5–8 with a 4.21 ERA in 88 games. In 1151⁄3 innings, he walked 48 batters and struck out 68. He hit .278 in 18 career at-bats.