| Birth Date: | 7 October 1896 |
| Birth Place: | Hanover, German Empire |
| Death Place: | Hildesheim, West Germany |
Margareta "Grete" Rosenberg (October 7, 1896 - February 5, 1979) was a German freestyle swimmer, who competed in the 1912 Summer Olympics. She won a silver medal in the relay together with her teammates Wally Dressel, Louise Otto and Hermine Stindt. She finished fourth in the 100 metre freestyle competition.[1]