Alpha Delta Gamma (ΑΔΓ), commonly known as ADG, is an American Greek-letter Catholic social fraternity and one of 75 members of the North American Interfraternity Conference (NIC). Based on Christian principles and the traditions of the Jesuit Order of the Catholic Church, Alpha Delta Gamma was founded at Loyola University Chicago on October 10, 1924, as a response to the unwillingness of most national fraternities to colonize at Catholic colleges and universities.