Robert William Duncan (born July 5, 1948) is an American Anglican bishop. He was the first primate and archbishop of the Anglican Church in North America (ACNA) from June 2009 to June 2014. In 1997, he was elected bishop of the Episcopal Diocese of Pittsburgh. In 2008, a majority of the diocesan convention voted to leave the diocese and the Episcopal Church and, in October 2009, named their new church the Anglican Diocese of Pittsburgh. (The Episcopal Church continued to maintain its Diocese of Pittsburgh under new leadership.) Duncan served as bishop for the new Anglican diocese until 10 September 2016 upon the installation of his successor, Jim Hobby.