Sir Bernard Arthur Owen Williams, FBA (21 September 1929 – 10 June 2003) 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.

As Knightbridge Professor of Philosophy at the University of Cambridge and Deutsch Professor of Philosophy at the University of California, Berkeley, Williams became known for his efforts to reorient the study of moral philosophy to psychology, history, and in particular to the Greeks.^[1][2] Described by Colin McGinn as an "analytical philosopher with the soul of a general humanist,"^[3] he was sceptical about attempts to create a foundation for moral philosophy. Martha Nussbaum wrote that he demanded of philosophy that it "come to terms with, and contain, the difficulty and complexity of human life.