Catholic Church

The Catholic Church (Latin: Ecclesia Catholica), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. The Church consists of 24 sui iuris (autonomous) churches, including the Latin Church and 23 Eastern Catholic Churches, which comprise almost 3,500 dioceses and eparchies around the world, each overseen by one or more bishops. The pope, who is the bishop of Rome, is the chief pastor of the church.

The core beliefs of Catholicism are found in the Nicene Creed. The Catholic Church teaches that it is the one, holy, catholic and apostolic church founded by Jesus Christ in his Great Commission, that its bishops are the successors of Christ's apostles, and that the pope is the successor of Saint Peter, upon whom primacy was conferred by Jesus Christ. It maintains that it practises the original Christian faith taught by the apostles, preserving the faith infallibly through scripture and sacred tradition as authentically interpreted through the magisterium or teaching office of the church. The Roman Rite and others of the Latin Church, the Eastern Catholic liturgies, and communities and societies such as mendicant orders, enclosed monastic orders, third orders and voluntary charitable lay associations reflect a variety of theological and spiritual emphases in the church.

Of its seven sacraments, the Eucharist is the principal one, celebrated liturgically in the Mass. The church teaches that through consecration by a priest, the sacramental bread and wine become the body and blood of Christ. The Virgin Mary is venerated as the Mother of God, and Queen of Heaven; she is honoured in dogmas, such as that of her Immaculate Conception, perpetual virginity and assumption into heaven, and devotions. Catholic social teaching emphasizes voluntary support for the sick, the poor, and the afflicted through the corporal and spiritual works of mercy. The Catholic Church operates tens of thousands of Catholic schools, universities and colleges, hospitals and orphanages around the world, and is the largest non-governmental provider of education and health care in the world. Among its other social services are numerous charitable and humanitarian organizations.

The Catholic Church has profoundly influenced Western philosophy, culture, art, literature, music, law and science. Catholics live all over the world through missions, immigration, diaspora and conversions. Since the 20th century the majority have resided in the Global South, partially due to secularization in Europe and North America. The Catholic Church shared communion with the Eastern Orthodox Church until the East–West Schism in 1054, disputing particularly the authority of the pope. Before the Council of Ephesus in AD 431, the Church of the East also shared in this communion, as did the Oriental Orthodox Churches before the Council of Chalcedon in AD 451; all separated primarily over differences in Christology. The Eastern Catholic Churches, which have a combined membership of approximately 18 million, represent a body of Eastern Christians who returned or remained in communion with the pope during or following these schisms due to a variety of historical circumstances. In the 16th century the Reformation led to the formation of separate, Protestant groups and to the Counter-Reformation. From the late 20th century the Catholic Church has been criticized for its teachings on sexuality, its doctrine against ordaining women and its handling of sexual abuse committed by clergy.

The Diocese of Rome, led by the pope as its bishop, constitutes his local jurisdiction, while the See of Rome—commonly referred to as the Holy See—serves as the central governing authority of the Catholic Church. The administrative body of the Holy See, the Roman Curia, has its principal offices in Vatican City, which is a small, independent city-state and enclave within the city of Rome, of which the pope is head of state and the elective and absolute monarch.

Catholic (from Greek: καθολικός, romanized: katholikos, lit. 'universal') was first used to describe the church in the early 2nd century. The first known use of the phrase "the catholic church" (Greek: καθολικὴ ἐκκλησία, romanized: katholikḕ ekklēsía) occurred in the letter written about AD 110 from Saint Ignatius of Antioch to the Smyrnaeans, which read: "Wheresoever the bishop shall appear, there let the people be, even as where Jesus may be, there is the universal [katholike] Church." In the Catechetical Lectures (c. 350) of Saint Cyril of Jerusalem, the name "Catholic Church" was used to distinguish it from other groups that also called themselves "the church". The "Catholic" notion was further stressed in the edict De fide Catolica issued in 380 by Theodosius I, the last emperor to rule over both the eastern and the western halves of the Roman Empire, when establishing the state church of the Roman Empire.

Since the East–West Schism of 1054, the Eastern Orthodox Church has taken the adjective Orthodox as its distinctive epithet; its official name continues to be the Orthodox Catholic Church. The Latin Church was described as Catholic, with that description also denominating those in communion with the Holy See after the Protestant Reformation of the 16th century, when those who ceased to be in communion became known as Protestants.

While the Roman Church has been used to describe the pope's Diocese of Rome since the Fall of the Western Roman Empire and into the Early Middle Ages (6th–10th century), Roman Catholic Church has been applied to the whole church in the English language since the Protestant Reformation in the late 16th century. Further, some will refer to the Latin Church as Roman Catholic in distinction from the Eastern Catholic churches. "Roman Catholic" has occasionally appeared in documents produced by the Holy See, and has been used by certain national episcopal conferences and local dioceses.