Randal Harold Niemann
- Bats Left, Throws Left
- Height 6' 4", Weight 200 lb.
- School College of the Redwoods
- High School Fortuna Union High School
- Debut May 20, 1979
- Final Game June 20, 1987
- Born November 15, 1955 in Scotia, CA USA
Randy Niemann pitched three complete games and two shutouts in seven starts as a rookie with the 1979 Houston Astros. This flash of brilliance did not foreshadow his major league career, as he only made three more starts the rest of his career. He was a member of the bullpen of the World Champion 1986 New York Mets but did not appear in the postseason.
In 2006, he was the pitching coach of the Norfolk Tides. He was the bullpen coach of the New York Mets in 2009 and 2010, then in 2011 was named the organization's pitching rehab coordinator, working closely with ace Johan Santana. He left the Mets after that season to join the Boston Red Sox organization in 2012. He started the season as the assistant pitching coach before replacing Bob McClure as the full-time pitching coach on August 20th. Niemann was the pitching coach for the Springfield (MO) Cardinals in 2013-2014 and Palm Beach Cardinals in 2015-2017.