| Birth Date: | 29 June 1898 |
| Birth Place: | Jönköping, Sweden |
| Death Date: | 25 September 1981 (aged 83) |
| Death Place: | Norrköping, Sweden |
| Sport: | Athletics |
| Event: | Shot put, high jump, triple jump, pole vault, decathlon |
| Club: | Örebro SK |
| Pb: | SP – 15.08 m (1927) HJ – 1.80 m (1918) TJ – 13.68 m (1918) PV – 3.40 m (1918) Decathlon – 6393 (1918) |
| Show-Medals: | yes |
Oskar Bertil Petrus Jansson (29 June 1898 – 25 September 1981) was a Swedish athlete.[1] He competed in the shot put at the 1920 and 1924 Summer Olympics and finished in ninth and eighth place, respectively.
Jansson won the Swedish shot put title in 1916 and 1918–1929 and the English one in 1919 and 1921. In 1918 he also competed domestically in decathlon.