Mark Twang is a 1976 album by American bluegrass singer-songwriter and instrumentalist John Hartford. Much of his songs for the album were inspired by Hartford's experiences working on a riverboat, notably "The Julia Belle Swain" and "Let Him Go on Mama." The album was recorded all acoustic in the studio with Hartford by himself on all instruments and vocals. At the Grammy Awards of 1977, Mark Twang won the Grammy Award for Best Ethnic or Traditional Folk Recording.