Eastmountainsouth was an American folk pop duo formed in 1999 in Los Angeles, California, and composed of vocalists Kat Maslich-Bode and Peter Bradley Adams. The duo released their self-titled debut album in 2003 after signing a deal with Dreamworks Records. This is the duo's one and only album as they have since parted ways. Both have since released or begun work on solo projects since their split in 2004. Despite not being well-known and having only released the one album, several songs from it have been used prominently in film and television.

Their version of Stephen Foster's song "Hard Times (Come Again No More)" was featured on the Elizabethtown motion picture soundtrack. The track "So Are You To Me" was prominently featured on the soundtrack of the movie Lucky 7 and appeared in a Season 3 episode of "Alias".

Their song "You Dance" was featured in a first season episode of the television series One Tree Hill and the song "Ghost" was used in a fifth season episode of Dawson's Creek. In 2003 the band opened for Lucinda Williams.

Since splitting, both Kat Maslich-Bode and Peter Bradley Adams have since released, or begun, work on solo projects since their split.