Niels Grunenberg

Niels Grunenberg (born 30 March 1975) is a German Paralympic swimmer. He represented Germany at the 2008 Summer Paralympics and at the 2012 Summer Paralympics and he won the silver medal in the men's 100 metres breaststroke SB5 event in 2012.

In 2013, he won the bronze medal in the men's 100 metre breaststroke SB5 event at the 2013 IPC Swimming World Championships held in Montreal, Quebec, Canada.