Bettina Cass AO FASSA (born 1940) is an Australian sociologist and social policy adviser. As of 2020 she is emeritus professor at both the University of New South Wales and the University of Sydney. Bettina Cass was born in Waverley, New South Wales, Australia in 1940. Cass was elected Fellow of the Academy of the Social Sciences in Australia in 1989. She was appointed Officer of the Order of Australia in the 1990 Australia Day Honours for "service to social security policy and women's affairs".