| Birth Date: | 17 March 1896 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 23 February 1985 (aged 88) |
| Death Place: | Stockholm, Sweden |
| Sport: | Swimming and water polo |
| Club: | Stockholms KK |
| Show-Medals: | yes |
Klas Erik "Nello" Andersson (17 March 1896 – 23 February 1985) was a Swedish swimmer and water polo player. He competed in water polo at the 1920 and 1924 Summer Olympics and finished in third and fourth place, respectively. In 1912 he was eliminated in the first round of the 100 m freestyle swimming event.
Andersson was the youngest among four siblings: Robert was also a water polo player and swimmer and competed in the same team in 1920. Adolf was a swimmer, and Selma was a diver.[1]