member of either of two separate but similar congregations of secular priests, one centred in Rome and the other in France.

The Institute of the Oratory of St. Philip Neri (Neri, Saint Philip) was founded by the saint in Rome in 1575, approved in 1612, and confederated and reapproved in 1942. It consists of independent communities of secular priests held under obedience but not bound by vows, and it is dedicated to prayer, preaching, and the sacraments. Associated with it is the Brotherhood of the Little Oratory, a confraternity of clerics and laymen. Although the seat of government is in Rome, there are other foundations elsewhere, notably in Italy, in Spain, and in England.

The Congregation of the Oratory of Jesus and Mary Immaculate—popularly called the Bérullians as well as the Oratorians—derives and takes some of its rules from the organization of St. Philip, but it is a distinct institution, founded by Pierre de Bérulle (Bérulle, Pierre de) in 1611 and approved in 1613; it later underwent a number of reconstitutions and reapprovals, the latest in 1925. The chief work of this French congregation is the training of candidates for the priesthood.