| Birth Date: | 1983 8, df=y |
| Birth Place: | Kassel, Hesse, West Germany |
| Height: | 1.66 m |
| Weight: | 60 kg |
| Sport: | Swimming--> |
| Club: | GSV Eintracht Baunatal in der SG ACT |
| Show-Medals: | yes |
Annika Mehlhorn (born 5 August 1983) is a butterfly and medley swimmer from Germany. She competed at the 2004 Summer Olympics in the 200 m butterfly, but failed to reach the final. She became European champion in the 200 m butterfly at the European Short Course Swimming Championships 2000 in Valencia. At the same event Mehlhorn won the silver medal at the 2001 World Aquatics Championships in Fukuoka, Japan.