Maureen O'Sullivan (born 10 March 1951) is an Irish former independent politician who served as a Teachta Dála (TD) for the Dublin Central constituency from 2009 to 2020.

After completing a BA at University College Dublin, she then went on to work as an English and History teacher and guidance counsellor in a secondary school in Baldoyle, a position she held for 30 years.

[3] She was a member of Tony Gregory's local political organisation in the 1970s, first canvassing for him and later serving as his election agent.

[6] In December 2015, Maureen O'Sullivan and fellow independent TDs Clare Daly and Mick Wallace each put forward offers of a €5,000 surety for a 23-year-old man being prosecuted under terrorism legislation in the Special Criminal Court in Dublin charged with membership of an illegal dissident republican terrorist organisation.

[9] O'Sullivan was criticised by the brother of late TD Tony Gregory, over an allegedly false claim made in her election literature.