The Congregation of The Holy Spirit (known also as the Congregation of the Holy Spirit under the protection of the Immaculate Heart of Mary, or in Latin, Congregatio Sancti Spiritus, C.S.Sp.) is a Roman Catholic congregation of priests, lay brothers, and since Vatican II, lay associates. Congregation members are known as Spiritans in Continental Europe, and as the Holy Ghost Fathers in English-speaking countries, although even there, they are becoming known as Spiritans. A Spiritan priest or brother has the abbreviation 'C.S.Sp.' after his name.