Britannica Sources used in this answer

Which religion is followed by most Gibraltarians?

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The majority of the population in Gibraltar follows the Roman Catholic faith, which accounts for approximately four-fifths of the Gibraltarian population.1

While Roman Catholicism is the most prevalent religion, it is important to note that Gibraltar has no official religion. The territory is also home to a small Jewish community of Sephardic descent, as well as an Anglican bishopric that serves communities in the region.21