| Niels Grunenberg | |
| Birth Date: | 1975 3, df=yes |
| Country: | Germany |
| Sport: | Paralympic swimming |
Niels Grunenberg (born 30 March 1975) is a German Paralympic swimmer.[1] 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.[1]
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.