Sissela Bok (born Sissela Myrdal on 2 December 1934) is a Swedish-born American philosopher and ethicist, the daughter of two Nobel Prize winners: Gunnar Myrdal who won the Economics prize with Friedrich Hayek in 1974, and Alva Myrdal who won the Nobel Peace Prize in 1982. She received her B.A. and M.A. in psychology from George Washington University in 1957 and 1958, and her Ph.D. in philosophy from Harvard University in 1970. Formerly a Professor of Philosophy at Brandeis University, Sissela Bok is currently a Senior Visiting Fellow at the Harvard Center for Population and Development Studies, Harvard School of Public Health.
She is married to Derek Bok, former president (1971-1991) and interim president (2006-2007) of Harvard. Her daughter, Hilary Bok, is also a philosopher. Sissela Bok's brother, Jan Myrdal, is a leftist-political writer and journalist.
She was awarded the Courage of Conscience award on 24 April 1991 "for her contributions to peacemaking strategies in the tradition of her mother".