Joseph John Dunne (born 25 May 1973) is an Irish football manager and former footballer who is currently the assistant manager of Mansfield Town. Dunne played as a defender in the Football League for Gillingham and Colchester United, and briefly played in the Conference for Dover Athletic. He once represented Republic of Ireland at under-21 level. His playing career was ended prematurely after suffering a series of injuries. He began coaching at Colchester United, earning his coaching badges and working his way up from youth level. He became the club's assistant manager when John Ward was appointed manager in 2010, before replacing Ward at the helm in September 2012 having previously acted as caretaker manager for four games in 2009. After guiding the club to League One safety in the 2012–13 and 2013–14 seasons, Dunne left his role on 1 September 2014. He then joined Cambridge United as an assistant manager on 11 May 2015.