| Birth Date: | 28 January 1973 |
| Birth Place: | Lennep, West Germany |
| Height: | 1.79m (05.87feet) |
| Weight: | 58kg (128lb) |
| Sport: | Swimming |
| Club: | SG Remscheid |
Stephanie Ortwig (born 28 January 1973) is a retired German swimmer who won a gold medal in the 4 × 200 m freestyle relay at the 1991 World Aquatics Championships. She also competed at the 1988 Summer Olympics and finished seventh in the 200 m, 400 m and 4 × 200 m freestyle events. Between 1988 and 1990 she won seven national titles in the 200–800 m freestyle disciplines. In 1988 she was selected as the German Junior Athlete of the Year.