Magnus, Robot Fighter is a fictional superhero who battles rogue robots in the year 4000, appearing in comic books created by writer/artist Russ Manning in 1963. Magnus first appeared in Magnus Robot Fighter 4000 A.D. #1, published by Gold Key Comics in February 1963. The character was subsequently published by Valiant Comics and Acclaim Comics in the 1990s, and was reintroduced by Dark Horse Comics in August 2010. Some aspects of the concept have varied with each publisher.

Gold Key Comics was an imprint of American company Western Publishing, created for comic books distributed to newsstands. Also known as Whitman Comics, Gold Key operated from 1962 to 1984.