Tanzania has a religiously plural society. Roman Catholic, Anglican, Evangelical Lutheran, Moravian, Pentecostal, Seventh-day Adventist and Jehovah's Witness communities are present alongside Sunni, Ismaili, Twelver Shia, Ahmadiyya and Ibadi Muslim communities. Hindu, Sikh, Buddhist, Baha'i and Jewish communities also exist, together with traditional belief systems and people who do not identify with a religion. External estimates published by the United States State Department and Pew Research Center in 2020 suggested about 63% Christian and 34% Muslim, but these figures are estimates rather than results of an official Tanzanian religious census. Zanzibar is predominantly Muslim, while Tanzania Mainland has substantial Christian and Muslim communities, especially in coastal and urban areas. Traditional beliefs may be combined with everyday religious practice, but accusations or practices involving witchcraft can create serious legal and social risks. The Constitution protects the freedom to choose, change and practise a religion, including private worship, religious teaching and peaceful association. The law may restrict conduct to protect other people's rights, public order, safety, morality or health. Article 20 also prevents the establishment of a religious political party. Tanzania does not have one institution that supervises all faiths. Christian bodies include the Tanzania Episcopal Conference and the Christian Council of Tanzania, while Muslim coordination includes BAKWATA, the Mufti Mkuu wa Tanzania, the Mufti Mkuu wa Zanzibar and other Muslim councils. The Interreligious Council for Peace Tanzania, known as IRCPT, connects registered Muslim, Christian, Baha'i, Buddhist, Hindu and other bodies for dialogue and peace work; it does not make religious law or decide disputes. Religious life may include Sunday worship or Mass, preaching, prayer, baptism, confirmation, Jumu'ah Friday prayer, Ramadan, Eid, Zakat, Quran instruction, madrasa education, Hajj and Umrah. The exact practice, membership requirements, fees and ceremony depend on the community or congregation. Worship is often supported by donations or membership contributions. Hajj and Umrah costs vary with the provider, travel arrangements and service package. Common religious holidays include Id-ul-Fitr, Id-el-Haj, Maulidi Day, Good Friday, Easter Monday, Christmas Day and Boxing Day. Islamic dates follow the lunar calendar, and annual public-holiday dates are announced and scheduled accordingly. A public holiday does not itself require a person to take part in a religious ceremony. A religious organization operating in Tanzania Mainland generally needs registration with the Registrar of Societies under the Ministry of Home Affairs. The Societies Act, Cap. 337, makes operation as a society without registration unlawful. The registration system can consider public order, good government, incomplete forms, the existence of the proposed organization, a confusingly similar name or political foreign connections. The Ministry provides the RSMIS portal, and its 2023 guidance listed an annual fee of TZS 100,000 for a religious society. Registered organizations also face reporting and financial-record duties. Published information does not establish one uniform processing time or first-registration fee for every application. Zanzibar has its own constitutional, governmental, educational and judicial arrangements, so the Tanzania Mainland registration process does not automatically apply there. Schools must provide access without religious discrimination. The education framework provides for religious instruction in the curriculum, including Religious Education, Bible Knowledge, Divinity and Islamic Religious Education from Grade 1 through Form 6, delivered with the involvement of appropriate religious leaders. A learner over 18 decides personally, while parents decide for minors; a learner cannot be required to attend a particular religious class or worship against the applicable legal and parental rules. Teachers are not generally required to organize religious education or worship. School admission and accreditation remain state-regulated, while fees depend on the institution. Religious naming ceremonies, Aqiqah, baptism, confirmation, religious marriage and funeral rites are normally organized by communities. They do not replace civil birth or death registration through the relevant state process, including RITA where applicable. On Tanzania Mainland, the Law of Marriage Act, Cap. 29, recognizes civil, Christian, Islamic and customary forms of marriage. A marriage requires at least 21 days between notice and the ceremony and at least two witnesses who are each at least 18 years old; a religious minister or Kadhi registers a religious marriage. Ceremony costs depend on the congregation or provider. Religious mediation and marriage councils may be practically relevant, but state courts apply the law. In Zanzibar, Kadhi's Courts handle Muslim personal-law matters such as marriage, divorce and inheritance, while ordinary courts handle other civil and criminal matters. The applicable registry, documents, identity evidence and court fees depend on the procedure and jurisdiction.
Religion in Tanzania
Religion in Tanzania includes Christian, Muslim, Hindu, Sikh, Buddhist, Baha'i, Jewish and other communities, as well as traditional beliefs and non-religious positions. External estimates suggest that Christians and Muslims form the largest groups, but Tanzania's 2022 census did not publish an official religious distribution. The Constitution protects freedom of thought, conscience, belief, faith, worship and religious association, subject to legal limits that protect other people and public order. Religious practice, education, marriage, holidays and life events are organized through different communities and institutions rather than one national religious authority.
Tip
Start by identifying whether your matter concerns Tanzania Mainland or Zanzibar, because registration, education and family-law arrangements differ. For an organization, school matter or marriage, confirm the responsible institution and required documents before spending money or holding a formal ceremony. Treat religious practice and civil registration as separate steps.

