Ilkka Kalevi Nummisto (24 April 1944 – 29 June 2019) was a Finnish sprint canoer. He competed at four Summer Olympics (1964, 1968, 1972 and 1976). His best Olympic finish was fifth in the K-4 1000 m event in Mexico City, 1968. After his Olympic career finished, he appeared in the finals of the World's Strongest Man competition five times between 1986 and 1992.
Nummisto was born in Turku. He died on 29 June 2019, at the age of 75.