| Nida Senff | |
| Full Name: | Dina Willemina Jacoba Senff |
| Nickname: | Nida |
| Birth Date: | 1920 4, df=yes |
| Birth Place: | Rotterdam, Netherlands |
| Death Place: | Amstelveen, Netherlands |
| Strokes: | Backstroke |
Dina Willemina Jacoba "Nida" Senff (3 April 1920 – 27 June 1995) was a backstroke swimmer from the Netherlands who won the 100 metres backstroke at the 1936 Summer Olympics in Berlin. She did so after missing a turning point, went back to push the wall, and still won the race.[1] Senff won the Dutch title in the 100 metres backstroke in 1935 and 1937, and set five world records in 100 m, 150 yd and 200 m backstroke in 1936–1937.[2] [3] In 1983, she was inducted to the International Swimming Hall of Fame.[4]