Walter Korn (22 May 1908; Prague, Czechoslovakia – July 9, 1997; San Mateo, California) was a Czech-born, naturalised American author of books and magazine articles about chess. Despite his status as a writer, there is no known record of him playing tournament chess, and few chess players ever met him. One of his few known games is a draw against a 13 year old Gordon Crown, published in the April 1943 issue of Chess. Korn was a FIDE International Judge for chess compositions and contributed the entire topic of chess for the Encyclopædia Britannica (1972).
Korn was the author of Modern Chess Openings (MCO), which was considered an authoritative work on the openings of chess. A new edition of MCO would come out every five years or so, and it was essential reading for tournament chess players.