Erling Knudtzon (born 15 December 1988) is a Norwegian professional footballer who plays as a midfielder for Eliteserien club Lillestrøm.

He made his first team debut on 14 April 2007 against Fredrikstad, and played twenty Norwegian top flight games in his first season, most of them as a starter.

[1] On 1 February 2010 Knudtzon signed a three-year contract with Lillestrøm, and reunited with his former coach Henning Berg.

On 17 July 2018, Molde FK announced that they had signed Knudtzon to a three-year contract, beginning 1 January 2019.

[5] Knudtzon played a total of 17 games and scored two goals for Norway at international youth and under-23 level.