Onni Pellinen (14 February 1899 – 30 October 1950) was a Finnish wrestler and Olympic medalist in Greco-Roman wrestling.
Pellinen competed at the 1924 Summer Olympics in Paris where he won a bronze medal in Greco-Roman wrestling, the light heavyweight class.
He won another bronze medal at the 1928 Summer Olympics in Amsterdam.
At the 1932 Summer Olympics in Los Angeles he won a silver medal.