Michael O'Reilly (born circa 1690, died 1758) was an Irish prelate of the Roman Catholic Church.

[1][2][3] Born in County Cavan, he studied theology in Paris and was ordained in 1710.

He was Rector of Drogheda, and was recommended as the Bishop of Derry by James Francis Edward Stuart on 10 April 1739.

[4] His papal brief was dated 24 April 1739 and his episcopal ordination took place on 23 September 1739.

[4] O'Reilly was translated to the Metropolitan see of Armagh as archbishop and primate on 23 January 1749.