Hop Harrigan is an American old-time radio juvenile adventure program. It was broadcast on ABC from August 31, 1942, until August 2, 1946, and on Mutual from October 2, 1946, until February 6, 1948. General Foods began sponsoring the program on October 2, 1944; it had previously been unsponsored.

The Hop Harrigan character originated in All American Comics, and the radio program was adapted from that publication. Harrigan was a young aviator, and most of the show's plots dealt with his battles with the Axis powers during World War II. At age 18, Harrigan was not much older than the show's target audience of young listeners. In his book, Radio Crime Fighters: Over 300 Programs from the Golden Age, Jim Cox wrote that Harrigan's "detecting and crime fighting enthralled the adolescents for whom it was intended, creating a loyal following that clung to every new action-packed crisis."

The program was produced in cooperation with the Air Training Corps of America and was endorsed by the Office of the Adjutant General of the Army.