Sir Donnell Justin Patrick Deeny PC DL, KC, SC (born 25 April 1950), styled as the Rt Hon Sir Donnell Deeny, is a mediator and arbitrator (ACIArb) and a former member of the Court of Appeal of Northern Ireland.Sir Donnell is also member of the Court of Arbitration for Art at The Hague. He was appointed in 2000 to the British Government's Spoliation Advisory Panel, which advises on claims relating to cultural objects lost during the Nazi era. He served two further terms before becoming chairman of the Panel in 2012. He was elected as the 56th Pro-Chancellor of the University of Dublin in 2014.