| Birth Date: | 3 March 1923 |
| Birth Place: | Grevie, Sweden |
| Death Date: | 12 May 2005 (aged 82) |
| Death Place: | Västra Frölunda, Sweden |
| Sport: | Boxing |
| Club: | Redbergslids Boxningsklubb |
| Show-Medals: | yes |
Nils Gunnar Lorentz Nilsson (3 March 1923 – 12 May 2005) was a Swedish heavyweight boxer who won a silver medal at the 1948 Summer Olympics. After the Olympics he turned professional and had a record of 12 wins, 4 losses and 2 draws before retiring in 1956.
Below is the record of Gunnar Nilsson, a Swedish heavyweight boxer who competed at the 1948 London Olympics: