| Birth Date: | 25 August 1915 |
| Birth Place: | Kungshamn, Sweden |
| Death Date: | 29 March 1999 (aged 83) |
| Death Place: | Lidingö, Stockholm, Sweden |
| Sport: | Diving |
| Club: | SoIK Hellas, Nacka |
| Show-Medals: | yes |
Knut Lennart Herbert Brunnhage (25 August 1915 – 29 March 1999) was a Swedish diver who won a silver medal in the 10 m platform at the 1947 European Championships. Next year he finished fourth in this event at the 1948 Summer Olympics.