John Marty Stuart (born September 30, 1958) is an American country and bluegrass music singer, songwriter, and musician. Active since 1968, Stuart initially toured with Lester Flatt, and then in Johnny Cash's road band before beginning work as a solo artist in the early 1980s. He is known for his combination of rockabilly, country rock, and bluegrass music influences, his frequent collaborations and cover songs, and his distinctive stage dress.

His greatest commercial success came in the first half of the 1990s on MCA Records Nashville. Stuart has recorded over 20 studio albums, and has charted over 30 times on the Billboard Hot Country Songs charts. His highest chart entry is "The Whiskey Ain't Workin'", a duet with Travis Tritt.

Stuart has won five Grammy Awards out of 16 nominations. He is also a member of the Grand Ole Opry and Country Music Hall of Fame.