The Oratory of Saint Philip Neri is a congregation of Catholic priests and lay-brothers who live together in a community bound together by no formal vows but only with the bond of charity.

They are commonly referred to as Oratorians.

It must not be confused with the French Oratory, a distinct congregation, Society of the Oratory of Jesus (Société de l'Oratoire de Jésus) founded by Pierre de Bérulle in 1611 in Paris.The Congregation is founded by St. Philip Neri (1515–1595) in the city of Rome.

Today it has spread around the world, with over 70 Oratories and some 500 priests.

The post-nominal initials commonly used to identify members of the order are "C.O.".

The abbreviation "Cong.

Orat."

is also used.Unlike a religious order (the members of which take vows and are answerable to a central authority) or a monastery (the monks of which are likewise bound by vows in a community that may itself be autonomous and answerable directly to the Pope), the Oratorians are made up of members who commit themselves to membership in a particular, independent, self-governing local community (an Oratory, usually named for the place in which it is located: e.g., Birmingham Oratory, Brooklyn Oratory) without actually taking vows, an unusual and innovative arrangement created by Neri.

Normally an oratory must have a minimum of 4 members, 2 being ordained, in order to be founded.

If a group of men seeks to establish an oratory, they may apply to do so, going through the proper diocesan channels; during the process of formation a member (or members) of a well-established oratory resides in the community to facilitate every aspect of the proposed foundation.