Dara O'Hagan (born 29 August 1964) is an Irish republican activist and former politician in Northern Ireland. She was elected in 1998 to the Northern Ireland Assembly as a Sinn Féin member for Upper Bann.
O'Hagan has obtained a BA (Hons) Combined Humanities (History and Politics) from the University of Ulster and an MSc in Irish Politics and a PhD from Queens University, Belfast. Her father was prominent republican J. B. O'Hagan.