James O'Reilly (October 10, 1855—December 19, 1934) was an Irish-born prelate of the Roman Catholic Church.

James O'Reilly was born in Lisgrea, County Cavan Ireland on June 24, 1882.

[1] He was educated at All Hallows College in Dublin O'Reilly was ordained to the priesthood on June 24, 1882, for the Archdiocese of St. Paul.

After his ordination, he served as pastor in parishes in Belle Creek, Lake City and Stillwater, Minnesota.

[2] On December 18, 1909, O'Reilly was appointed the second bishop of the Diocese of Fargo by Pope Pius X.