| Niels Hagenau | |
| Birth Date: | 4 December 1943 |
| Nationalteam1: | Denmark |
| Nationalyears1: | 1971 |
| Nationalcaps1: | 5 |
| Nationalgoals1: | 0 |
Niels Hagenau (born 4 December 1943) is a Danish footballer.[1] He played in five matches for the Denmark national football team in 1971.[2]