A recent analytical report by Pew Research Center, "The Global Catholic Population," indicates the countries with the highest Catholic population today, and how the global face of Catholicism has changed in the last century.

The study, which surveyed 232 countries and territories, finds that as of 2010 the Catholic Church had 1.1 billion adherents worldwide. The Catholic Church is the body of churches that are in full communion with the Bishop of Rome. This includes the Roman Catholic Church and 22 Eastern Catholic Churches. This study defines adherents as those who self-identify as Catholics. This includes those whose religious views might be deemed unorthodox, and those who seldom pray or attend church.

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