Boris Peter Bransby Williams (born 24 April 1957) is a French-born English drummer best known for his extensive work with the Cure (1984–1994). Born in Versailles, France, he had previously worked with various artists, including Thompson Twins, Kim Wilde, Strawberry Switchblade and Tomato City.

Williams is one of seven children; he has two brothers - Michael and Morgan - and four sisters - Juliet, Caroline, Mira, and Sarah. Williams dated Caroline Crawley, lead singer of Shelleyan Orphan. Williams first joined The Cure in 1984 (first gig on 7 November in Minneapolis, Minnesota, USA), replacing Andy Anderson, who was fired for destroying a hotel room after a racially motivated incident with a security guard.