Theophilus MacCartan (1700–1778) was an Irish Roman Catholic Prelate and Bishop of Down and Connor. He served as Bishop of Down and Connor from 10/9/1760 until his death 16/12/1778. MacCartan was a scion of a long established family McCartan in the wider Barony of Kinelarty, one of the seven baronies in County Down. It is the most central and contains the towns of Ballynahinch, Saintfield, Downpatrick, Clough, Dundrum, Newcastle and Castlewellan.