| Full Name: | Lennart Klas Valdemar Klingström |
| Birth Date: | 18 April 1916 |
| Birth Place: | Österåker, Stockholm, Sweden |
| Death Date: | 5 July 1994 (aged 78) |
| Death Place: | Danderyd, Stockholm, Sweden |
| Sport: | Canoe racing |
| Club: | Brunnsvikens Kanotklubb, Stockholm |
| Show-Medals: | yes |
Lennart Klas Valdemar Klingström (18 April 1916 – 5 July 1994) was a Swedish sprint canoeist who competed in the late 1940s and early 1950s. He won the gold in the K-2 1000 m event at the 1948 Summer Olympics in London.
Klingström also won four medals at the ICF Canoe Sprint World Championships with three golds (K-1 4×500 m: 1948, 1950; K-4 1000 m: 1948) and a silver (K-1 500 m: 1950).