Mary Elizabeth Frances Henry (born 11 May 1940 in Blackrock, Cork) is an Irish politician and a former Independent member of Seanad Éireann. By profession she is a University Professor and medical practitioner. In 1966 she married John McEntagart of Dublin, Merchant and they have three children. She is a member of the Church of Ireland.
She is a graduate of the University of Dublin (B.A. in English and History of Medicine 1963, M.B. (Honours) (1965), M.A. (1966) M.D. (1968)). As an undergraduate, amongst many other distinctions she won the Sir James Craig Memorial Prize in Medicine (named after a man who represented Dublin University in the Dáil).
She represented the graduates of the University of Dublin in the Seanad from 1993 until 2007. She did not stand in the 2007 Seanad election, when Ivana Bacik was elected to succeed her.