| Irena Fleissnerová | |
| Fullname: | Irena Fleissnerová |
| Nationality: | Czech |
| Strokes: | Breaststroke |
| Birth Date: | 25 November 1958 |
| Birth Place: | Plzeň, Czechoslovakia |
| Weight: | 58kg (128lb) |
Irena Fleissnerová (born 25 November 1958 in Plzeň) is a retired breaststroke swimmer from Czechoslovakia, who won two gold medals at the 1979 Summer Universiade in Mexico City, Mexico. She represented Czechoslovakia at the 1980 Summer Olympics in Moscow.