The Hermit's Cave was a syndicated radio horror series that aired from September 1937 into the mid-1940s on WJR AM in Detroit, Michigan. It was also broadcast on WBBM in Chicago and KMPC AM in Los Angeles from 1940 to 1944, with William Conrad as the producer. The series began with the Hermit, a mysterious narrator who introduced each episode's chilling ghost stories, weird tales, and murder mysteries. The Hermit character was voiced by various actors, including John Kent, Charles Penman, Toby Grimmer, Klock Ryder, Mel Johnson, and John Dehner.

The show was created by G.A. Richards from the WJR station and featured a mix of regional casts and young talents, many of whom went on to have successful careers in radio acting. The Hermit's Cave was sponsored by the Carter Coal Company, advertising its Olga Coal product, and the Simoniz Company, promoting its automotive care products. The show returned to WJR in January 1950 and was also referred to as "The Mummers". Of the 800 episodes produced, fewer than 40 are currently available.