List of Christian denominations by number of members

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 0.2 million 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. With an estimated 2.42 or 2.3 billion adherents in 2015, Christianity is the largest religious group in the world, and in 2020 there were about 2.6 billion adherents globally.

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.

;Latin Church – 1.327 billion

;Eastern Catholic Churches – 18 million
* Byzantine Rite – 8.2 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 Church – 4.3 million
** Chaldean Catholic Church – 0.6 million
* West Syriac Rite – 4.1 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

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)
* Chinese Patriotic Catholic 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 Catholic Church – 0.002 million

Protestantism – 900 million–1 billion

Protestantism is the second largest major group of Christians by number of followers. Estimates vary from 800 million to 1 billion, or between 31% and 38% of all Christians.Global Christianity – A Report on the Size and Distribution of the World's Christian Population
, The Pew Forum on Religion & Public Life, December 2011 The main reason for this wide range is the lack of a common agreement among scholars as to which denominations constitute Protestantism. For instance, most sources but not all include Anabaptism, Anglicanism, Baptists and Independent Nondenominational Christianity as part of Protestantism. Moreover, Protestant denominations altogether do not form a single structure comparable to the Catholic Church, or to a lesser extent the Eastern Orthodox communion. However, several different comparable communions exist within Protestantism, such as the World Evangelical Alliance, Anglican Communion, World Communion of Reformed Churches, World Baptist Alliance, World Methodist Council and the World Lutheran Federation. Regardless, 900 million is the most accepted figure among various authors and scholars, and thus is used in this article. Note that this 900 million figure also includes Anglicanism, as well as Anabaptists, Baptists and multiple other groups that might sometimes disavow a common "Protestant" designation, and would rather prefer to be called, simply, "Christian".

Historical Protestantism – 300–500 million

The number of individuals who are members of historical Protestant Churches totals to 300-500 million.

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Anglicanism – 110 million

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There are about 110 million Christians in Anglican tradition, mostly part of the Anglican Communion, the third-largest Christian communion in the world, with 42 members (provinces).
* Anglican Communion – 85 million
** Church of England – 25.0 million
** Church of Nigeria – 20.1 million
** Church of Uganda – 8.1 million
** Anglican Church of Kenya – 5.0 million
** Church of South India – 3.8 million
** Province of the Episcopal Church of South Sudan – 3.5 million
** Anglican Church of Australia – 3.1 million
** Anglican Church of Southern Africa – 2.3 million
** Anglican Church of Tanzania – 2.0 million
** Episcopal Church in the United States – 1.7 million
** Church of North India – 1.5 million
** Province of the Episcopal Church of Sudan – 1.1 million
** Anglican Church of Rwanda – 1.0 million
** Church of the Province of Central Africa – 0.9 million
** Anglican Church of Burundi – 0.8 million
** Church in the Province of the West Indies – 0.8 million
** Anglican Church in Aotearoa, New Zealand and Polynesia – 0.6 million
** Church of the Province of the Indian Ocean – 0.5 million
** Church of Christ in Congo–Anglican Community of Congo – 0.5 million
** Church of Pakistan – 0.5 million
** Province of the Anglican Church of the Congo - 0.5 million
** Church of Ireland – 0.4 million
** Anglican Church of Canada – 0.4 million
** Church of the Province of West Africa – 0.3 million
** Anglican Church of Melanesia – 0.2 million
* Continuing Anglican movement and independent churches – 0.4 million
** Traditional Anglican Communion – 0.4 million
** Anglican Church in North America – 0.13 million
** Reformed Evangelical Anglican Church of South Africa – 0.09 million

= Baptist churches – 100 million

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The worldwide Baptist community numbers about 100 million. However, the Baptist World Alliance, the world communion of Baptist churches, self-reports only 47 million baptized believers, as Baptists do not count children as members. Therefore, the BWA is the 8th largest Christian communion.
* Southern Baptist Convention – 13.7 million
* National Baptist Convention, USA, Inc. – 8.4 million
* Nigerian Baptist Convention – 6.5 million
* National Missionary Baptist Convention of America – 3.1 million
* National Baptist Convention of America, Inc. – 3.1 million
* Baptist Union of Uganda – 2.5 million
* Baptist Community of Congo – 2.1 million
* Baptist Convention of Tanzania – 2.0 million
* Brazilian Baptist Convention – 1.8 million
* Baptist General Convention of Texas – 1.7 million
* Progressive National Baptist Convention – 1.5 million
* Council of Baptist Churches in Northeast India – 1.3 million
* American Baptist Churches USA – 1.2 million
* Baptist Bible Fellowship International – 1.2 millionRon Rhodes, ''The Complete Guide to Christian Denominations'', Harvest House, 2007
* Lott Carey Foreign Mission Convention – 1.1 million
* Baptist Community of the Congo River – 1.1 million
* National Primitive Baptist Convention of the U.S.A. – 1.0 million
* Myanmar Baptist Convention – 1.0 million
* Cooperative Baptist Fellowship – 0.8 million
* Baptist General Association of Virginia – 0.6 million
* Baptist Convention of Kenya – 0.6 million
* Nagaland Baptist Church Council – 0.6 million
* Korea Baptist Convention – 0.5 million
* Samavesam of Telugu Baptist Churches – 0.5 million
* Orissa Evangelical Baptist Crusade – 0.5 million
* National Baptist Convention (Brazil) – 0.4 million
* Baptist Convention of Malawi – 0.3 million
* Garo Baptist Convention – 0.3 million
* Convention of Philippine Baptist Churches – 0.3
* Ghana Baptist Convention – 0.3
* Union of Baptist Churches in Rwanda – 0.3 million
* Conservative Baptist Association of America – 0.2 million
* National Association of Free Will Baptists – 0.2 million
* Convention of Visayas and Mindanao of Southern Baptist Churches – 0.2 million
* Manipur Baptist Convention – 0.2 million
* Evangelical Baptist Church of the Central African Republic – 0.2 million
* Converge – 0.2 million
* Seventh Day Baptists – 0.05 million

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Lutheranism – 70–90 million

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The number of adherents in the Lutheran denomination totals to 70-90 million persons (the Lutheran World Federation reports 77 million, and is the sixth largest communion), being represented in the following churches:
* Evangelical Church in Germany – 20.2 million (10.0 million United Protestants, i.e. Lutheran & Reformed; 9.9 million Lutherans; 0.3 million Reformed)
* Ethiopian Evangelical Church Mekane Yesus – 10.4 million
* Evangelical Lutheran Church in Tanzania – 7.9 million
* Church of Sweden – 5.6 million
* United Evangelical Lutheran Churches in India – 4.5 million
* Church of Denmark – 4.3 million
* Batak Christian Protestant Church – 4.0 million
* Evangelical Lutheran Church of Finland – 3.7 million
* Church of Norway – 3.5 million
* Malagasy Lutheran Church – 3.0 million
* Evangelical Lutheran Church in America – 3.0 million
* The Lutheran Church of Christ in Nigeria – 2.2 million
* Lutheran Church–Missouri Synod – 1.8 million
* Evangelical Lutheran Church of Papua New Guinea – 1.2 million
* Evangelical Lutheran Church in Namibia – 0.7 million
* Evangelical Lutheran Church in Southern Africa – 0.6 million
* Evangelical Church of the Lutheran Confession in Brazil – 0.5 million
* The Protestant Christian Church – 0.5 million
* Evangelical Lutheran Church in the Republic of Namibia – 0.4 million
* Evangelical Free Church of America – 0.4 million
* The Indonesian Christian Church – 0.3 million
* Lutheran Congregations in Mission for Christ – 0.3 million
* Evangelical Lutheran Church of Cameroon – 0.3 million
* Evangelical Church of the Augsburg Confession in Austria – 0.3 million
* Evangelical Lutheran Church in Zimbabwe – 0.3 million
* Evangelical Lutheran Church of Latvia – 0.3 million
* Christian Protestant Church in Indonesia – 0.3 million
* Wisconsin Evangelical Lutheran Synod – 0.3 million
* Church of Iceland – 0.2 million
* Simalungun Protestant Christian Church – 0.2 million
* Evangelical Lutheran Church of Brazil – 0.2 million
* Protestant Church of Augsburg Confession of Alsace and Lorraine – 0.2 million
* Evangelical Church of the Augsburg Confession in Slovakia – 0.2 million
* Evangelical-Lutheran Church in Hungary – 0.2 million
* Estonian Evangelical Lutheran Church – 0.2 million

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Reformed churches (Calvinism) – 60–80 million

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The Reformed tradition is represented by 60-80 million people who hold membership in the following churches; the World Communion of Reformed Churches is the fourth-largest communion.
* Presbyterianism – 40 million
** Presbyterian Church of East Africa – 4.0 million
** Presbyterian Church of Nigeria – 3.8 million
** Presbyterian Church of Africa – 3.4 million
** National Presbyterian Church in Mexico – 2.8 million
** Church of Christ in Congo–Presbyterian Community of Congo – 2.5 million
** Presbyterian Church of Korea (TongHap) – 2.4 million
** Presbyterian Church in Korea (HapDong) – 2.4 million
** Presbyterian Church in Cameroon – 2.0 million
** Presbyterian Church of Cameroon – 1.8 million
** Church of Central Africa Presbyterian – 1.8 million
** Presbyterian Church in Korea (BaekSeok) – 1.5 million
** Presbyterian Church of India – 1.3 million
** Presbyterian Church (USA) – 1.2 million
** Presbyterian Church in Sudan – 1.0 million
** Presbyterian Church of Ghana - 1.0 million
** Presbyterian Church of Brazil – 0.7 million
** Evangelical Presbyterian Church, Ghana – 0.6 million
** United Church of Christ in the Philippines – 0.5 million
** Uniting Presbyterian Church in Southern Africa – 0.5 million
** United Church of Canada – 0.4 million
** Presbyterian Church in America – 0.4 million
** Presbyterian Church of Pakistan – 0.4 million
** Presbyterian Church in Korea (Koshin) – 0.4 million
** Church of Scotland – 0.3 million or 1.5 million
** Korean Presbyterian Church – 0.3 million
** Presbyterian Church in Rwanda – 0.3 million
** Uniting Church in Australia – 0.2 million
** Presbyterian Church in Taiwan – 0.2 million
** Presbyterian Church in Ireland – 0.2 million
* Continental Reformed churches – 30 million
** Church of Jesus Christ in Madagascar – 3.5 million
** Protestant Church in Indonesia – 3.1 million
** United Church in Zambia – 3.0 million
** Evangelical Church of Cameroon – 2.5 million
** Swiss Reformed Church – 2.4 million
** Christian Evangelical Church in Timor – 2.0 million
** Protestant Church in the Netherlands – 1.6 million
** Dutch Reformed Church in South Africa (NGK) – 1.1 million
** Christian Evangelical Church in Minahasa – 0.7 million
** United Church in Papua New Guinea and the Solomon Islands – 0.6 million
** Protestant Church in Western Indonesia – 0.6 million
** Evangelical Christian Church in Tanah Papua – 0.6 million
** Protestant Church of Maluku – 0.6 million
** Reformed Church in Hungary – 0.6 million
** Reformed Church in Romania – 0.6 million
** Uniting Reformed Church in Southern Africa – 0.5 million
** Toraja Church – 0.4 million
** Reformed Church of France – 0.4 million
** Lesotho Evangelical Church – 0.3 million
** Evangelical Christian Church in Halmahera – 0.3 million
** Christian Church of Sumba – 0.3 million
** Karo Batak Protestant Church – 0.3 million
** Christian Reformed Church of Nigeria – 0.3 million
** Reformed Church in Zambia – 0.3 million
** Evangelical Reformed Church in Angola – 0.2 million
** Reformed Church in America – 0.2 million
** Christian Reformed Church in North America – 0.2 million
** Kalimantan Evangelical Church – 0.2 million
** Javanese Christian Church – 0.2 million
** Indonesia Christian Church – 0.2 million
** Church of Christ in the Sudan Among the Tiv – 0.2 million
** Evangelical Church of Congo – 0.2 million
** Christian Evangelical Church of Sangihe Talaud – 0.2 million
** Central Sulawesi Christian Church – 0.2 million
** Evangelical Reformed Church in Bavaria and Northwestern Germany – 0.2 million
* Congregationalism – 5 million
** Evangelical Congregational Church in Angola – 0.9 million
** United Church of Christ – 0.8 million
** United Congregational Church of Southern Africa – 0.5 million

=Methodism – 60–80 million

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The Methodist movement is represented by 60–80 million people (a figure including adherents but non-members), found in denominations including the following; the World Methodist Council is the fifth largest communion.
* United Methodist Church – 12 million
* African Methodist Episcopal Church – 2.5 million
* Church of the Nazarene – 2 million
* Methodist Church Nigeria – 2 million
* The Salvation Army – 1.8 million
* Methodist Church of Southern Africa – 1.7 million
* African Methodist Episcopal Zion Church – 1.4 million
* Korean Methodist Church – 1.3 million
* United Methodist Church of Ivory Coast – 1 million
* Free Methodist Church – 0.9 million
* Christian Methodist Episcopal Church – 0.9 million
* Methodist Church Ghana – 0.8 million
* Methodist Church in India – 0.6 million
* Methodist Church in Kenya – 0.5 million
* Korean Evangelical Church of America, Korean Holiness Evangelical Church – 0.5 million
* Wesleyan Church – 0.4 million
* Methodist Church of Great Britain – 0.2 million
* Methodist Church in Brazil – 0.2 million
* Methodist Church of Fiji and Rotuma – 0.2 million
* Global Methodist Church – Just formed in May of 2022

=Adventism – 22.3 million

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* Seventh-day Adventist Church – 21.9 million
* Church of God (Seventh-Day) – 0.2 million
* Advent Christian Church - 0.1 million
* Seventh Day Adventist Reform Movement - 0.042 million

=Restorationism – 7 million

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* Churches of Christ – 5 million
* Churches of Christ in Australia - 0.05 million
* Christian churches and churches of Christ – 1.1 million
* Community of Disciples of Christ in Congo – 0.7 million
* Christian Church (Disciples of Christ) – 0.4 million

=Anabaptists, Anabaptism – 4 million

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* Mennonites – 2.1 million
* Schwarzenau Brethren (German Baptists) – 1.5 million
* Amish – 0.3 million
* Hutterites – 0.05 million

= Plymouth Brethren – 1 million

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The Plymouth Brethren number around 1 million members.

= Hussites – 1 million

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* Moravian Church, Moravians – 0.825 million
* Czechoslovak Hussite Church – 0.14 million
* Unity of the Brethren Baptists, Unity of the Brethren – 0.035 million

= Quakers – 0.4 million

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Modern Protestantism – 400–500 million

The denominations listed below did not emerge from the Reformation, Protestant Reformation of the 16th century or its commonly acknowledged offshoots. Instead, they are broadly linked to Pentecostalism or similar other independent evangelical and revivalistic movements that originated in the beginning of the 20th century. For this reason, several sources tend to differentiate them from Protestants and classify them together as Independents, Non-core Protestants etc. Also included in this category are the numerous, yet very similar Nondenominational Christianity, Nondenominational churches. Nonetheless, sources eventually combine their numbers to the Protestant tally. Despite the absence of centralized control or leadership, if considered as a single cohort, this will easily be the second largest Christian tradition after Roman Catholicism. According to the Center for the Study of Global Christianity (CSGC), there are an estimated 450 million Independents world-wide, as of mid-2019.

=Pentecostalism – 280 million

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Those who are members of the Pentecostal denomination number around 280 million people.
* Assemblies of God – 67 million (the 7th largest communion)
* Apostolic Church (1916 denomination), Apostolic Church – 15 million
* International Circle of Faith – 11 million
* Fangcheng Fellowship – 10 million
* China Gospel Fellowship - 10 million
* International Church of the Foursquare Gospel - 9 million
* Ethiopian Kale Heywet Church - 9 million
* Church of God in Christ - 6.5 million
* Church of God (Cleveland, Tennessee) - 6 million
* Jesus Is Lord Church Worldwide – 5 million
* Ethiopian Full Gospel Believers' Church - 4.5 million
* International Pentecostal Holiness Church – 4 million
* Christian Congregation of Brazil – 2.8 million
* The Pentecostal Mission – 2.5 million
* True Jesus Church – 2.5 million
* The Church of Pentecost – 2.1 million
* Universal Church of the Kingdom of God – 2 million
* Apostolic Faith Mission of South Africa – 1.2 million
* Church of God of Prophecy – 1.5 million
* Association of Pentecostal Churches of Rwanda – 1 million
* God is Love Pentecostal Church – 0.8 million
* Association of Vineyard Churches – 0.3 million

=Nondenominational Christianity – 80–100 million

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* Calvary Chapel – 25 million
* Christian and Missionary Alliance – 6 million
* Born Again Movement – 3 million
* Church of God (Anderson, Indiana) – 1.2 million

=African initiated church, African initiated churches – 60 million

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60 million people are members of African initiated churches.
* Zion Christian Church – 15 million
* Eternal Sacred Order of Cherubim and Seraphim – 10 million
* Kimbanguism, Kimbanguist Church – 5.5 million
* Redeemed Christian Church of God – 5 million
* Church of the Lord (Aladura) – 3.6 million
* Council of African Instituted Churches – 3 million
* Church of Christ Light of the Holy Spirit – 1.4 million
* African Church of the Holy Spirit – 0.7 million
* African Israel Church Nineveh – 0.5 million

=Three-Self Patriotic Movement, Chinese Patriotic Christian Churches - 25 million

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=New Apostolic Church – 10 million

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The New Apostolic Church has around 10 million members.

=Local churches (affiliation), Local churches – 1 to 10 million

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=Messianic Judaism – 0.3 million

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Messianic Judaism has a membership of 0.3 million people.

Eastern Protestant Christianity – 22 million

Eastern Protestant Christianity (or Eastern Reformed Christianity) encompasses a range of heterogeneous Protestant Christian denominations that developed outside of the Occident, from the latter half of the nineteenth century and yet keeps elements of Eastern Christianity, to varying degrees. Most of these denominations came into being when existing Protestant Churches adopted Protestant Reformers, reformational variants of Orthodox Christianity, Orthodox Christian liturgy and worship; while others are the result of reformations of Orthodox Christianity, Orthodox Christian beliefs and practices, inspired by the teachings of Western Protestant missionaries. Some Protestant Eastern Churches are in Communion (religion), communion with similar Western Protestant Churches. However, Protestant Eastern Christianity within itself, does not constitute a Full communion, single communion. This is due to the diverse polities, practices, liturgies and orientations of the denominations which fall under this category.
* P'ent'ay, Ethiopian-Eritrean Evangelical Church – 16.5 million, Alexandrian Rite
* Believers Eastern Church – 3.5 million, West Syrian Rite
* Mar Thoma Syrian Church – 1 million, Syro-Antiochene Rite (in communion with the Anglican Communion)
* Armenian Evangelical Church – 0.25 million, Armenian Rite
* St. Thomas Evangelical Church of India - 0.1 million, Syro-Antiochene Rite
* Evangelical Church of the Augsburg Confession in Slovenia - 0.02 million, Byzantine Rite
* Evangelical Church of Romania – 0.16 million, Byzantine Rite
* Laestadianism – 0.15 million, Mostly Byzantine Rite
* Kosovo Protestant Evangelical Church – 0.15 million, Byzantine Rite

Eastern Orthodoxy – 220 million

The best estimate of the number of Eastern Orthodox Christians is 220 million or 80% of all Orthodox Christians worldwide. Its main body consists of the various autocephaly, autocephalous churches along with the autonomous and other churches canonically linked to them, for the most part form a single communion, making the Eastern Orthodox Church the second largest single denomination behind the Catholic Church. In addition, there are several Eastern Orthodox splinter groups and non-universally recognized churches.

;Autocephalous churches – 168 million
* Russian Orthodox Church – 100 million
* Romanian Orthodox Church – 17–18.8 millionEastern Orthodox Churches
at World Council of Churches
* Church of Greece – 10 million
* Serbian Orthodox Church – 8-12 million
* Bulgarian Orthodox Church – 8-10 million
* Ecumenical Patriarchate of Constantinople – 5.25 million
* Greek Orthodox Church of Antioch – 4.3 million
* Georgian Orthodox Church – 3.5 million
* Macedonian Orthodox Church – Ohrid Archbishopric, Macedonian Orthodox Church – 2 million
* Church of Cyprus – 0.7 million
* Polish Orthodox Church – 0.6 million
* Greek Orthodox Church of Alexandria – 0.5 million
* Orthodox Autocephalous Church of Albania, Albanian Orthodox Church – 0.4 million
* Greek Orthodox Church of Jerusalem – 0.4 million
* Czech and Slovak Orthodox Church – 0.075 million

;Autonomous churches – 13 million
* Ukrainian Orthodox Church (Moscow Patriarchate) – 7.2 million
* Metropolis of Chișinău and All Moldova, Metropolitan Church of Chișinău and All Moldova (Moscow Patriarchate) – 3.2 million
* Russian Orthodox Church Outside Russia – 0.4 million
* Metropolis of Bessarabia, Metropolitan Church of Bessarabia (Moldova) (Romanian Patriarchate) – 0.72 million"Biserica Ortodoxă Română, atacată de bisericile 'surori'" ("The Romanian Orthodox Church, Attacked by Its 'Sister' Churches")
, ''Ziua'', 31 January 2008
* Orthodox Ohrid Archbishopric (North Macedonia) – 0.34 million
* Estonian Orthodox Church of Moscow Patriarchate, Estonian Orthodox Church (Moscow Patriarchate) – 0.3 million
* Finnish Orthodox Church (Ecumenical Patriarchate) – 0.06 million
* Chinese Orthodox Church (Moscow Patriarchate) – 0.03 million
* Japanese Orthodox Church (Moscow Patriarchate) – 0.03 million
* Latvian Orthodox Church (Moscow Patriarchate) – 0.02 million
* Estonian Apostolic Orthodox Church, Estonian Orthodox Church (Ecumenical Patriarchate) – 0.02 million

;Churches in communion with the above Orthodox Churches but with disputed autocephaly – 19 million
* Orthodox Church of Ukraine – 12–18 million
* Orthodox Church in America – 1 million

;Non-universally recognized churches – 3.82 million
* Belarusian Autocephalous Orthodox Church – 2.4 million
* Orthodox Church of Greece (Holy Synod in Resistance) – 0.75 million
* Old Calendar Bulgarian Orthodox Church – 0.45 million
* Orthodox Church in Italy – 0.12 million
* Old Calendarist Romanian Orthodox Church – 0.05 million
* Montenegrin Orthodox Church – 0.05 million

;Other separated Orthodox groups – 6 million

* Old Believers – 5.5 million
* Greek Old Calendarists – 0.86 million
* True Orthodox Church – 0.85 million
* Evangelical Orthodox Church – 0.07 million
* Autocephalous Turkish Orthodox Patriarchate – 0.002

Oriental Orthodox Churches, Oriental Orthodoxy – 62 million

The Oriental Orthodox Churches are those descended from those that rejected the Council of Chalcedon in 451. Despite the similar name, they are therefore a different branch of Christianity from the Eastern Orthodox (see above). There are an estimated 62 million Oriental Orthodox Christians, worldwide.
;Autocephalous churches – 61.7 million
* Ethiopian Orthodox Tewahedo Church – 37 million
* Coptic Orthodox Church – 10 million
* Armenian Apostolic Church – 9 million
** Mother See of Holy Etchmiadzin – 6 million
** Holy See of Cilicia – 1.5 million
** Armenian Patriarchate of Constantinople – 0.5–0.7 million
** Armenian Patriarchate of Jerusalem – 0.34 million
* Eritrean Orthodox Tewahedo Church - 2 million
* Malankara Orthodox Syrian Church - 2 million
* Syriac Orthodox Church – 1.4 million
** Jacobite Syrian Christian Church – 1.2 million

;Autonomous churches – 0.01 million
* French Coptic Orthodox Church – 0.01 million

;Churches not in communion – 0.07 million
* Malabar Independent Syrian Church – 0.06 million
* British Orthodox Church – 0.01 million

Non-trinitarian Restorationism – 35 million

A sixth group is composed by Nontrinitarian Restorationism, Restorationists. These groups are quite distinct from orthodox Trinitarian restorationist groups such as the Disciples of Christ, despite some shared history.
;Latter Day Saint movement (Mormonism) – 17 million
* The Church of Jesus Christ of Latter-day Saints – 16.8 million
* Community of Christ – 0.25 million

;Jehovah's Witnesses – 8.7 million

;Oneness Pentecostalism – 6 million
* United Pentecostal Church International – 4 million
* Pentecostal Assemblies of the World – 1.5 million

;Minor denominations – 4.4 million
* Iglesia ni Cristo – 2.3 million
* The Unification Church (aka Moonies) – 1–2 million
* La Luz del Mundo – around million (See La Luz del Mundo#Membership statistics)
* Unitarian Universalism – 0.6 million
** Unitarian Universalist Association – 0.2 million
(Unitarian Universalism developed out of Christian traditions but no longer identifies as a Christian denomination.)
* Church of Christ, Scientist – 0.4 million
* Pentecostal Missionary Church of Christ (4th Watch), Church of Christ, 4th Watch – 0.6 million
* Friends of Man – 0.07 million
* Christadelphians - 0.05 million
* Family International – 0.01 million

Church of the East – 0.6 million

Divisions occurred within the church itself, but by 1830 two unified patriarchates and distinct churches remained: the Assyrian Church of the East and the Chaldean Catholic Church (an Eastern Catholic Church in communion with the Holy See). The Ancient Church of the East split from the Assyrian Church of the East in 1968. In 2017, the Chaldean Catholic Church had approximately 628,405 members, the Assyrian Church of the East 323,300, while the Ancient Church of the East had 100,000.
* Assyrian Church of the East – 0.5 million
* Ancient Church of the East – 0.1 million

See also

* Christian state
* List of Christian denominations
* List of current Christian leaders
* List of largest church buildings
* List of schisms in Christianity
* List of the largest Protestant denominations
* Major religious groups

References

External links

Yearbook of American and Canadian Churches

National Council of Churches USA

Pew Research Center – News Release 2002

Pew Research Center - 2015 ''America's Changing Religious Landscape''

Association of Religion Data Archives

{{DEFAULTSORT:Denominations By Number of Members
Lists of Christian denominations,
Lists by population, Christian denominations