Karl Johan "Jonni" Hellström (13 May 1907 - 1989) was a Finnish boxer who competed in the 1928 Summer Olympics.
"The Fighting Finn" was born in Mariehamn and died in Canada.
In 1928 he was eliminated in the quarter-finals of the welterweight class after losing his fight to Robert Galataud.
Below is the record of Johan Hellström, a Finnish welterweight boxer who competed at the 1928 Amsterdam Olympics: