Can Catholics receive Holy Communion at a non-Catholic church and vice versa?
(1399-1401, 1336, 1213) We can consider three groups of non-Catholics: Eastern Orthodox Christians, Protestant Christians, and non-Christians. Eastern Orthodox Christians Although they are not in full communion with the Catholic Church, Eastern Orthodox Churches possess true sacraments, above all, by apostolic succession, the priesthood and the Eucharist. While Orthodox and Catholic priests cannot concelebrate the Holy Eucharist together, the Catholic faithful are encouraged to participate in Orthodox liturgies, including the Divine Liturgy (Mass), even though it is generally not possible for Catholics to receive Holy Communion in an Orthodox church. Catholic Church law allows Catholics to receive the sacrament of the Eucharist from an Orthodox priest in certain restrictive circumstances, but the Orthodox Churches are usually more restrictive, allowing only members of their own Churches to receive Holy Communion, excluding all others. Likewise, our law allows an Orthodox Christian to a
