Coscon 5 was held November 3-5, 1978 at The Huntington Sheraton in Pasadena, CA. The GoH was Robert Bloch.

This is a convention page. Please extend it by adding information about the convention, including dates, GoHs, convention chairman, location, sponsoring organization, external links to convention pages, awards given, the program, notable events, anecdotes, pictures, scans of publications, pictures of T-shirts, con reports, etc.