Protestantism is one of the six approved religions in Indonesia, the others being Islam, Roman Catholicism, Hinduism, Buddhism, and Confucianism. It constitutes the bulk of Christianity in Indonesia, which is the second largest religion in the country after Islam.

The Catholic Church in Indonesia is part of the worldwide Catholic Church, under the spiritual leadership of the pope in Rome. Catholicism is one of the six approved religions in Indonesia, the others being Islam, Protestantism, Hinduism, Buddhism, and Confucianism. According to official figures, Catholics made up 3.12 percent of the population in 2018. The number of Catholics is, therefore, more than 8.3 million. Indonesia is primarily Muslim, but Catholicism is the dominant faith in certain areas of the country.