Erling Størmer (born 2 November 1937) is a Norwegian mathematician, who has mostly worked with operator algebras. He was born in Oslo as a son of Leif Størmer. He was a grandson of Carl Størmer and nephew of Per Størmer. He took his doctorate at Columbia University in 1963 with thesis advisor Richard Kadison, and was a professor at the University of Oslo from 1974 to his retirement in 2007. He is a member of the Norwegian Academy of Science and Letters. In 2012 he became a fellow of the American Mathematical Society.