John Lyon, known professionally as Southside Johnny, is an American singer-songwriter who usually fronts his band Southside Johnny and the Asbury Jukes.

Southside Johnny and the Asbury Jukes are an American musical group from the Jersey Shore led by Southside Johnny. They have been recording albums since 1976 and are closely associated with Bruce Springsteen and The E Street Band. They have recorded or performed several Springsteen songs, including "The Fever" (1973) and "Fade Away" (1980). Springsteen has also performed with the band on several occasions. In 1991, Springsteen and the E Street band appeared on Southside Johnny's Better Days album.