Erkki Aarno Mallenius (12 January 1928 – 2 July 2003) was a Finnish amateur boxer who won a bronze medal in the light welterweight division at the 1952 Olympics.
Mallenius took up boxing in 1945 and in 1946 won the Finnish junior lightweight title.
He never held a senior national title, and qualified to the Helsinki Olympics by winning the 1952 Olympic trials.
At the Olympics he won his first two bouts, but broke a carpal bone in a hand in the second one, and hence withdrew from the semifinal and retired from boxing.
He then worked as a boxing coach and a building contractor.
In 2008 he was inducted into the Finnish Boxing Hall of Fame.