Kelpo Olavi Gröndahl (28 March 1920 – 2 August 1994) was a light-heavyweight Greco-Roman wrestler from Finland. He competed at the 1948 and 1952 Olympics and won a silver and a gold medal, respectively. He won another silver medal at the 1953 World Championships and finished fifth at the 1947 European Championships. Domestically he won 15 national titles, 11 in Greco-Roman (1943, 1946–1955) and 4 in freestyle wrestling (1948–1950, 1952). Gröndahl was married and had four children, born in 1946, 1947, 1949 and 1956.