Can non-Catholics receive Communion at Mass?

Not exclusion, but honesty

Saying "Amen" when receiving the Eucharist means: I believe this is the body of Christ, and I am in communion with this Church and everything she teaches. Because "we, though many, are one body, for we all partake of the one loaf" (1 Corinthians 10:17), Communion expresses a unity that, sadly, does not yet fully exist between divided Christians (CCC 1398).

The Church therefore asks non-Catholics not to receive — not as a judgement on their sincerity, but because it would signal a unity that is not real.

What visitors can do

• Come to Mass. Everyone is welcome to attend, pray and listen.
• Receive a blessing. At Communion time, come forward with arms crossed over your chest; the priest will bless you.
• Make a spiritual communion from the pew — a prayer expressing desire to be united with Christ.

The exceptions

• Orthodox Christians share valid sacraments and the faith in the Real Presence; the Catholic Church permits them to receive if they ask on their own accord and are properly disposed (CCC 1399), though their own Churches usually discourage it.
• Other baptized Christians may receive in grave necessity — such as danger of death — if they share Catholic faith in the Eucharist, cannot reach their own minister, and ask for it themselves (CCC 1401).

Catholics, too, must be prepared

The same principle applies to Catholics: those conscious of serious sin should go to confession first (1 Corinthians 11:27-29). Communion is never a right; it is always a gift received with faith.