As player

• Houston Astros (1979-1980)
• Pittsburgh Pirates (1982-1983)
• Chicago White Sox (1984)
• New York Mets (1985-1986)
• Minnesota Twins (1987)

As coach

• New York Mets (1997-1999, 2001-2002, 2009-2010)
• Boston Red Sox (2012)

Career highlights and awards

• World Series Champion (1986)

Randal Harold Niemann (born November 15, 1955 in Scotia, California) is an American professional baseball coach and a former pitcher who appeared in 122 Major League games, all but 10 in relief, in 1979-1980 and 1982-1987 for the Houston Astros, Pittsburgh Pirates, Chicago White Sox, New York Mets and Minnesota Twins. Niemann was a southpaw pitcher who stood 6 feet 4 inches (1.93 m) tall and weighed 200 pounds (91 kg).

Niemann originally signed with the New York Yankees after he was selected in the second round of the secondary phase of the 1975 Major League Baseball Draft, and his active career spanned 14 pro seasons (1975-1988). In the Major Leagues, he worked in 200 innings pitched, and allowed 219 hits and 82 bases on balls, with 102 strikeouts, three saves and three complete games. He won seven of 15 decisions (.467) and compiled a career earned run average of 4.64.