Next to City Hall is the Odeon Theater, which has been in continuous operation since 1928. Odeon is the Greek word for theatre. In the late 1950's the Odeon was the site of the pre-premier of Walt Disney's Old Yeller, the classic movie about a boy and his dog based on Mason native Fred Gipson's book by the same name. A bronze statue of Old Yeller stands in front of the Mason County Library, two blocks south of the Courthouse on Post Hill Rd.

The Odeon Preservation Association, Inc. (OPA) purchased the building in September 1994 and is an ongoing process of renovating it. The neon along the top of the building has been replaced and the Odeon is lit up every night! Activities at the Odeon include first run movies, vintage movies, theater productions, and Mason County Opry held once a month.