Gretel is a German shortening of the name Margarete. It may refer to:
- Gretel, one of the main characters in the Brothers Grimm fairy tale Hansel and Gretel
- Gretel Bergmann (born 1914), German Jewish high jumper who was prevented from competing in the 1936 Berlin Olympics
- Gretel Ehrlich (born 1946), American travel writer, poet, and essayist
- Gretel Killeen (born 1963), Australian presenter
- Cyclone Gretel, in 1985
- Gretel (yacht), a 12-metre yacht that competed in the 1962 America's Cup
- Gretel II, a 12-metre yacht that competed in the 1970 America's Cup