A church can be measured by various criteria in order to determine its size. Such measures include area, volume, length, width, height, or capacity. Several churches individually claim to be "the largest church", which may be due to any one of these criteria.

This list includes churches that are still extant and have a known area of more than 2,000 m². Entries are included even if they currently do not function as a church — for example, the Hagia Sophia is included even though it does not currently function as a church; it was was originally built as a church but was later converted into a mosque and is now a museum. Churches are not included if no reliable sources are available for their stated sizes.

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