The Confederation of Oratories of Saint Philip Neri (Latin: Confoederatio Oratorii Sancti Philippi Nerii), abbreviated C.O. and commonly known as the Oratorians, is a Catholic society of apostolic life of pontifical right for men (priests and religious brothers) who live together in a community bound together by no formal vows but only with the bond of charity.

Founded in Rome in 1575 by Philip Neri, 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 society are "CO" (Congregatio Oratorii). The abbreviation "Cong. Orat." is also used.

Unlike a religious institute (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 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, Oxford Oratory, Brooklyn Oratory) without actually taking vows, an unusual and innovative arrangement created by Philip. Normally an oratory must have a minimum of four members, two 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.

The Congregation of the Oratory was founded by Philip Neri (1515–1595) in the city of Rome. The first Oratory received papal recognition in 1575. The new community was to be a congregation of secular priests living under obedience but bound by no vows. Speaking of Neri, whom he called "the saint of joy", Pope John Paul II said, "As is well known, the saint used to put his teaching into short and wise maxims: 'Be good, if you can...' He did not choose the life of solitude; but, in exercising his ministry among the common people, he also wished to be "salt" for all those who met him. Like Jesus, he was equally able to enter into the human misery present in the noble palaces and in the alleys of Renaissance Rome."

The core of Philip's spirituality focused on an unpretentious return to the lifestyle of the first Disciples of Christ. The object of the institute is threefold: prayer, preaching, and the sacraments.

Up to 1800 the Oratory continued to spread through Italy, Sicily, Spain, Portugal, Poland, and other European countries; in South America, Brazil, India, and Ceylon. Under Napoleon I the Oratory was in various places despoiled and suppressed, but the congregation recovered and, after a second suppression in 1869, again revived. A few houses were founded in Munich and Vienna.

There are 86 Congregations of the Oratory throughout the world. Each Community is autonomous, but there is a Confederation which facilitates contact with the Holy See. As such, the Congregation of the Oratory functions more like a monastic federation than like a religious institute.

Three documents govern the Oratory. The first is the "General Statutes" of the Congregation, which are guidelines to be followed throughout the world; these may be changed or modified when representatives from each Oratory gather every six years in a meeting called a "Congresso Generale". The second is the "Particular Statutes", which outline how an individual Oratory is to be conducted; these must be approved by Rome. The third document is the "Constitutions", which establish general norms, and outline the relationship between the Congregation and the Holy See. As the Oratory is a confederation, there is no central authority such as is found within the Dominicans, Franciscans, or Jesuits. The definitive foundation of an Oratorian Congregation is actually done by the Roman Pontiff directly, which makes a Congregation what is called a "Pontifical Right" foundation.