| Birth Date: | 1940 3, df=y |
| Birth Place: | Gelsenkirchen, Germany |
| Height: | 1.75m (05.74feet) |
| Weight: | 74kg (163lb) |
| Sport: | Swimming |
| Club: | SC Dynamo Berlin |
| Show-Medals: | yes |
Willi Messner (born 14 March 1940) is a retired East German swimmer. In 1964, he won a national title in the 200 m breaststroke and was selected for the 1964 Summer Olympics, but failed to reach the final.