Sir Bernard Arthur Owen Williams, FBA was an English moral philosopher. His publications include Problems of the Self (1973), Ethics and the Limits of Philosophy (1985), Shame and Necessity (1993), and Truth and Truthfulness (2002). He was knighted in 1999.

The Knightbridge Professorship of Philosophy is the senior professorship in philosophy at the University of Cambridge. There have been 22 Knightbridge professors, the incumbent being Rae Langton.