Odd Mæhlum (8 October 1921 – 5 July 2011) was a Norwegian javelin thrower. He represented Hamar IL. At the 1948 Summer Olympics he finished fifth in the javelin final with a throw of 65.32 metres. He finished fourth at the 1946 European Championships in Athletics. He became Norwegian champion from 1946-1949. His personal best throw was 69.08 metres (old type), achieved in September 1947 in Vikersund.