| Birth Date: | 1 May 1881 |
| Birth Place: | Stockholm, Sweden |
| Death Date: | 11 September 1957 (aged 76) |
| Death Place: | New York City, United States |
| Height: | 168 cm |
| Weight: | 59 kg |
| Sport: | Athletics |
| Event: | Marathon |
| Club: | Fredrikshofs IF, Stockholm |
| Pb: | 5 miles – 24:47.6 (1907) Marathon – 2:58:21 (1906) |
| Show-Medals: | yes |
Johan Frithiof Isidor "John" Svanberg (1 May 1881 - 11 September 1957) was a Swedish runner. He competed in the 5 miles and marathon at the 1906 Intercalated Games and 1908 Summer Olympics and won two silver and one bronze medals. In 1908 he set a world record over 3000 m that stood until 1911.[1]
After the 1908 Olympics Svanberg was deprived of his amateur status for some commercial activities. He moved to the United States, where he worked as a painter and continued competing in running. He died in New York in 1957.