Communion (Christian), the relationship between Christians as individuals or Churches
Full communion, a term used when two (or more) distinct Christian Churches say they are sharing the same communion
The Communion of Saints, a doctrine of Christianity mentioned in the Apostles' Creed
A group of related Christian churches or Christian denomination
The Eucharist or the Lord's Supper, Christian rite reenacting the Last Supper
The Communion rite, that part of the Eucharistic rite in which the consecrated bread and wine are distributed to participants in the Roman Catholic Mass
Communion (chant), the Gregorian chant that accompanies this rite
Closed communion is the practice of restricting the communion to members of a particular church or congregation
Open communion is the practice of allowing members of other churches to share communion, followed by most Protestant Christian churches