The Portuguese Catholic Church, or Catholic Church in Portugal, is part of the worldwide Catholic Church in communion with the Pope in Rome, under the Portuguese Episcopal Conference. The Catholic Church is the world's largest Christian organisation. It is Portugal's largest religion and its former state religion, and has existed in the territory since the Iberian Peninsula was ruled by the Roman Empire.

The East Indians, also called East Indian Catholics or Bombay East Indians, are an ethno-religious Indian Christian community native to the Seven Islands of Bombay and the neighbouring Mumbai Metropolitan Area of the Konkan division.