William Eugene Bufalino Sr (April 13, 1918 – May 12, 1990) was an American attorney who represented the International Brotherhood of Teamsters (IBT) from 1947 until 1971.
He retired in 1982.
Bufalino worked closely with Jimmy Hoffa until Hoffa's disappearance in 1975, presumably murdered.
William was the cousin of Northeast Pennsylvania mob don Russell Bufalino.