John Hamrick was an American entrepreneur in the theater business. He leased and owned a large number of vaudeville and movie theaters in the Northwest from at least the early 1920s until the late 1940s. Hamrick lived in Seattle, Washington and eventually assembled a string of theaters that included the Rex Theatre, which he was in charge of as early as 1913. the Oriental Theatre in Portland, Oregon, the Beverly, several Blue Mouse Theatres, the Music Box Theatre, the Riviera Theatre, and the Roxy Theatre. Hamrick also owned several theaters in Seattle and is generally credited as being the first Seattle theater owner to show "talking pictures."