| Birth Date: | 16 June 1968 |
| Birth Place: | Gera, East Germany |
| Height: | 1.92m (06.3feet) |
| Weight: | 84kg (185lb) |
| Sport: | Swimming |
| Club: | TSV Erfurt, Erfurt |
Christian Gessner (or Geßner; born 16 June 1968) is a retired German swimmer who won three medals in the 200 m and 400 m medley at the 1991 European Aquatics Championships and 1991 World Aquatics Championships. Next year, he finished fifth in the same events at the 1992 Summer Olympics.