This is a list of Christian denominations by number of members. It is inevitably partial and generally based on claims by the denominations themselves. The numbers should therefore be considered approximate and the article an ongoing work-in-progress.

The list includes the following Christian denominations: the Catholic Church including the Eastern Catholic Churches, all the Eastern Orthodox and Oriental Orthodox churches with some recognition and their offshoots, Protestant denominations with at least 200,000 members, all the other Christian branches with distinct theologies (such as Restorationist and Nontrinitarian denominations), the independent Catholic denominations, and the Church of the East.

List of Christian denominations by number of members

Christianity is the largest religious group in the world, with an estimated 2.6 billion adherents in 2020.

List of Christian denominations by number of members

Christian denominational families

Christianity – 2.6 billion

Catholicism – 1.345 billion

Catholicism is the largest branch of Christianity with 1.345 billion, and the Catholic Church is the largest among churches. Figures below are in accordance with the Annuario Pontificio, at 2019. The total figure does not include independent denominations that self-identify as Catholic, numbering some 18 million adherents.

List of Christian denominations by number of members

Latin Church – 1.327 billion

Eastern Catholic Churches – 18 million

Byzantine Rite – 8.7 million

Ukrainian Greek Catholic Church – 5.5 million

Melkite Greek Catholic Church – 1.6 million

Romanian Greek Catholic Church – 0.5 million

Ruthenian Greek Catholic Church – 0.4 million

Hungarian Greek Catholic Church – 0.3 million

Slovak Greek Catholic Church – 0.3 million

Belarusian Greek Catholic Church – 0.1 million

Italo-Albanian Catholic Church – 0.01 million

Greek Catholic Church of Croatia and Serbia – 0.01 million

Georgian Byzantine Catholic Church – 0.01 million

Albanian Greek Catholic Church – 0.01 million

Russian Greek Catholic Church – 0.01 million

Greek Byzantine Catholic Church – 0.006 million

Macedonian Greek Catholic Church – 0.001 million

Bulgarian Greek Catholic Church – 0.001 million

East Syriac Rite – 4.9 million

Syro-Malabar Catholic Church – 4.3 million

Chaldean Catholic Church – 0.6 million

West Syriac Rite – 4.2 million

Maronite Church – 3.5 million

Syro-Malankara Catholic Church – 0.5 million

Syriac Catholic Church – 0.2 million

Armenian Rite – 0.8 million

Armenian Catholic Church – 0.8 million

Alexandrian Rite – 0.5 million

Coptic Catholic Church – 0.2 million

Eritrean Catholic Church – 0.2 million

Ethiopian Catholic Church – 0.07 million

Canonically irregular groups

Society of Saint Pius X – 1 million

Sedevacantists

Congregation of Mary Immaculate Queen

Society of Saint Pius V

Independent Catholicism – 18 million

Various denominations that self-identify as Catholic, despite not being affiliated with the Catholic Church.

Philippine Independent Church – 6 million (in communion with the Anglican Communion) Catholic Patriotic Association – 5 million Apostolic Catholic Church – 5 million Traditionalist Mexican-American Catholic Church – 2 million Brazilian Catholic Apostolic Church – 0.56 million Old Catholic Church – 0.1 million (in communion with the Anglican Communion) Polish National Catholic Church – 0.03 million Palmarian Christian Church – 0.002 million