Kyösti Eemil "Köpi" Lehtonen (13 March 1931 – 15 November 1987) was a lightweight Greco-Roman wrestler from Finland.

He competed at the 1956, 1960 and 1964 Olympics and won a gold medal in 1956, placing fifth in 1960.

Previously he won two silver medals at the world championships in 1953 and 1955.

Lehtonen retired after the 1964 Olympics and coached the Norwegian (1964), Danish (1964) and Finnish national teams (1971–74).

This biographical article relating to a Finnish sport wrestler or wrestling coach is a stub.