Gregor Duthie Duncan (born 11 October 1950) is a retired Anglican bishop of the Scottish Episcopal Church who served as the Bishop of Glasgow and Galloway from 2010 to 2018.

He went on to study at the University of Glasgow and Clare College, Cambridge.

He began his ordained ministry as an assistant curate at Oakham.

[6] He was consecrated and installed at St Mary's Cathedral in Glasgow on 23 April 2010.

[8] He announced his retirement in 2018, with a valedictory Choral Evensong taking place on 7 October 2018 at St Mary's Cathedral.