William Bradford "Bill" Keith (December 20, 1939 – October 23, 2015) was a five-string banjoist who made a significant contribution to the stylistic development of the instrument.

After leaving the Bluegrass Boys, he joined the Jim Kweskin Jug Band playing plectrum banjo.

He was inducted into the International Bluegrass Music Hall of Fame at an awards ceremony in Raleigh, North Carolina on October 1, 2015, and delivered a heartfelt address on that occasion, just three weeks prior to his death from cancer at his home in Woodstock, New York on October 23, 2015, aged 75.

Earlier famed banjoist Earl Scruggs had designed a set of cams which were added to the banjo to perform this task.

[citation needed] Keith's invention made the extra hardware unnecessary, replacing two of the tuning machines already on the banjo — a more elegant solution.