| Birth Name: | Sieglinde Pfannerstill |
| Birth Place: | Tägerwilen, Switzerland |
| Height: | 178 cm |
| Weight: | 65 kg |
| Sport: | Athletics |
| Event: | Pentathlon, long jump |
| Pb: | LJ – 6.64 m (1969) |
| Club: | LC Zürich LC Dübendorf SC Liestal |
| Show-Medals: | yes |
Sieglinde Ammann (Pfannerstill, born 4 February 1946) is a retired Swiss pentathlete and long jumper. She competed at the 1968 and 1972 Summer Olympics with the best result of 17th place in the long jump in 1972. Previously Ammann finished 11th in this event at the 1969 European Championships. Her husband Ernst Ammann competed in the hammer throw at the 1968 Olympics.