| Full Name: | Karl Martin Lundén |
| Nationality: | Swedish |
| Birth Place: | By, Avesta Municipality, Sweden |
| Death Place: | Sollentuna, Stockholm, Sweden |
| Strokes: | Freestyle, backstroke |
| Club: | SK Neptun, Stockholm |
| Show-Medals: | yes |
Karl Martin Lundén (1 January 1925 – 14 February 2011) was a Swedish swimmer who won the 4×200 m freestyle European title in 1947. He competed at the 1948 Summer Olympics in the 100 m backstroke and 100 m and 4×200 m freestyle events and finished fourth in the relay.