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. With about 2.42 billions all over the world, Christianity is the largest religious group in the world.

The list includes the Catholic Church including the Eastern Catholic churches; all the Eastern Orthodox and Oriental Orthodox churches with some recognition and their spin-offs; the Protestant denominations; the provinces of the Anglican Communion with at least 0.2 million members; all the other Christian branches with distinct theologies, such as Restorationist and Nontrinitarianian denominations; the independent Catholic denominations; and the Church of the East.

Figures in accordance with Church’s Book of Statistics (2014).

Estimates of the total number of Protestants are very uncertain, partly because of the difficulty in determining which denominations should be placed in the category. However, it seems clear that Protestantism is the second largest major group of Christians after Catholicism by number of followers. Often that number is put at 800 million. Some sources, which put the number at 800 million, include also Anglicanism (see below) within Protestantism. However, Protestant denominations in differ vastly and do not form a single communion, comparable to those of the Catholic Church and Eastern Orthodoxy.

The most common estimate of the number of Eastern Orthodox Christians worldwide is 225–300 million, forming a single communion, making it the second largest, single Christian denomination behind the Catholic Church. These are the adherents of the recognized Orthodox jurisdictions (autocephalous and autonomous churches) that are in full communion with each other. In addition, there are some Orthodox splinter groups and non-universally recognized churches.

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