| Sport: | Diving |
| Birth Date: | 30 December 1899 |
| Birth Place: | Langenberg, Westphalia, German Empire |
| Death Place: | Ulm, West Germany |
Karl Julius Rehborn (30 December 1899 - 27 November 1987) was a German diver who competed in the 1928 Summer Olympics. He finished ninth in the 10 metre platform event. His younger sisters were also Olympic athletes: Hanni was a diver and Anni a swimmer.