| Birth Date: | 16 April 1946 |
| Birth Place: | Stockholm, Sweden |
| Height: | 1.7m (05.6feet) |
| Weight: | 60kg (130lb) |
| Sport: | Swimming |
| Club: | Västerås SS |
Ulla Birgitta Elisabeth Jäfvert (later Fahlén; born 16 April 1946) is a Swedish swimmer who won a silver medal in the 4 × 100 m freestyle relay at the 1966 European Aquatics Championships. Two years earlier at the 1964 Summer Olympics she finished fifth in the same event.
Jäfvert represented Västerås SS.[1]