Flatt and Scruggs were an American bluegrass duo. Singer and guitarist Lester Flatt and banjo player Earl Scruggs, both of whom had been members of Bill Monroe's band, the Bluegrass Boys, from 1945 to 1948, formed the duo in 1948. Flatt and Scruggs are viewed by music historians as one of the premier bluegrass groups in the history of the genre.

Flatt and Scruggs recorded and performed together until 1969. Their backing band, the Foggy Mountain Boys, included fiddle player Paul Warren, a master player in both the old-time and bluegrass fiddling styles whose technique reflected all qualitative aspects of "the bluegrass breakdown" and fast bowing style; dobro player Burkett Howard "Uncle Josh" Graves, an innovator of the advanced playing style of the instrument now used in the genre; stand-up bass player English P. "Cousin Jake" Tullock; and mandolinist John "Curly" Seckler.