Clifford Williams (born 14 December 1949) is an English musician, best known as the bassist and backing vocalist of the Australian hard rock band AC/DC. He started his professional music career in 1967 and had previously been in the English groups Home and Bandit. His first studio album with AC/DC was Powerage in 1978. Williams was inducted into the American Rock and Roll Hall of Fame as a member of AC/DC in 2003. Williams announced his retirement from AC/DC in 2016, but returned for their 2020 comeback album Power Up along with band mates Brian Johnson and Phil Rudd. His side projects include benefit concerts.