| Birth Date: | 4 January 1886 |
| Birth Place: | Örebro, Sweden |
| Death Date: | 2 May 1966 (aged 80) |
| Death Place: | Stockholm, Sweden |
| Sport: | Water polo |
| Club: | Stockholms KK |
| Show-Medals: | yes |
Karl Torsten Kumfeldt (4 January 1886 – 2 May 1966) was a Swedish water polo goalkeeper and breaststroke swimmer.[1] He competed in water polo at the 1908, 1912 and 1920 Summer Olympics and won one silver and two bronze medals. In 1908, he also took part in the 200 m breaststroke event.
Kumfeldt won seven national water polo titles with his club Stockholm KK. Between 1910 and 1912, he was secretary of the Swedish Swimming Federation and spent much effort on preparing swimming venues for the 1912 Summer Olympics in Stockholm.