William Franklin Lee IV (born September 8, 1952) is an American bassist known for his work on the Late Show with David Letterman as part of the CBS Orchestra and before that "The World's Most Dangerous Band" when Letterman hosted the NBC "Late Night" show.
Born in San Antonio, Texas, Lee has recorded and toured with many artists. He appeared on the Mark & Clark Band's hit record Worn Down Piano. He performs with his Beatles tribute band, The Fab Faux, which he co-founded in 1998.