Grischa Niermann (born 3 November 1975 in Hannover) is a German former professional road bicycle racer, who competed as a professional between 1999 and 2012. He started his career in 1997 with the Die Continentale team, where he won the Hessen-Rundfahrt in 1998. He moved to Rabobank in 1999, winning the Regio-Tour that year. His only victory after that with the Dutch squad was the Niedersachsen-Rundfahrt in 2001. Following his retirement after the 2012 Vuelta a España, he became part of the coaching staff at Rabobank Development Team. Since 2017 he is associate sports director at Team Jumbo Visma.

He has confessed to doping with EPO during his career.