Stephen Donnelly (born 14 December 1975) is an Irish Fianna Fáil politician who has been a Teachta Dála (TD) for the Wicklow constituency since the 2011 general election.At first an Independent, he became co-founder and joint leader of the Social Democrats, and stood successfully for that party at the 2016 general election.
He left the Social Democrats on 5 September 2016, and acted as an independent prior to joining Fianna Fáil in February 2017.