
In Christianity, ablution is a prescribed washing of part or all of the body or possessions, such as clothing or ceremonial objects, with the intent of purification or dedication. In Christianity, both baptism and footwashing are forms of ablution. Prior to praying the canonical hours at seven fixed prayer times, Oriental Orthodox Christians wash their hands and face. In liturgical churches, ablution can refer to purifying fingers or vessels related to the Eucharist. In the New Testament, washing also occurs in reference to rites of Judaism part of the action of a healing by Jesus, the preparation of a body for burial, the washing of nets by fishermen, a person's personal washing of the face to appear in public, the cleansing of an injured person's wounds, Pontius Pilate's washing of his hands as a symbolic claim of innocence and foot washing, now partly a symbolic rite within the Church. According to the Gospel of Matthew, Pontius Pilate declared himself innocent of the blood of Jesus by washing his hands. This act of Pilate may not, however, have been borrowed from the custom of the Jews. The same practice was common among the Greeks and Romans.

Baptism is a Christian rite of admission and adoption, almost invariably with the use of water, into Christianity. It may be performed by sprinkling or pouring water on the head, or by immersing in water either partially or completely, traditionally three times for each person of the Trinity. The synoptic gospels recount that John the Baptist baptised Jesus. Baptism is considered a sacrament in most churches, and as an ordinance in others. Baptism according to the Trinitarian formula, which is done in most mainstream Christian denominations, is seen as being a basis for Christian ecumenism, the concept of unity amongst Christians. Baptism is also called christening, although some reserve the word "christening" for the baptism of infants. In certain Christian denominations, such as the Lutheran Churches, baptism is the door to church membership, with candidates taking baptismal vows. It has also given its name to the Baptist churches and denominations.

A cantharus, also known as a phiala, is a fountain used by Christians for ablution before entering a church. These ablutions involve the washing of the hands, face, and feet. The cantharus is traditionally located in the exonarthex of the church. The water emitted by a cantharus is to be running water. The practice of ablutions before prayer and worship in Christianity symbolizes "separation form sins of the spirit and surrender to the Lord." Eusebius recorded this practice of canthari located in the courtyards of churches, for the faithful to wash themselves before entering a Christian house of worship. The practice has its origins Jewish practice of performing ablutions before entering into the presence of God. Though canthari are not as prevalent anymore in Western Christianity, they are found in Eastern Christian and Oriental Christian churches.

A holy well or sacred spring is a well or spring or other small body of water revered either in a Christian or pagan context, sometimes both. The term holy well is commonly employed to refer to any water source of limited size, which has some significance in the folklore of the area where it is located, whether in the form of a particular name, an associated legend, the attribution of healing qualities to the water through the numinous presence of its guardian spirit or Christian saint, or a ceremony or ritual centred on the well site. In Christian legend, the water is often said to have been made to flow by the action of a saint, a familiar theme especially in the hagiography of Celtic saints.

In certain denominations of Christianity, hygiene in Christianity includes a number of regulations involving cleanliness before prayer, as well as those concerning diet and apparel.

A lavabo is a device used to provide water for the washing of hands. It consists normally of an ewer or container of some kind to pour water, and a bowl to catch the water as it falls off the hands. In ecclesiastical usage it refers to all of: the basin in which the priest washes their hands; the ritual that surrounds this action in the Catholic Mass; and the architectural feature or fitting where a basin or place for one is recessed into the side wall of the sanctuary, or projects from it. If this last includes or included a drain, it is a piscina used for washing the church plate and other fittings, though the terms are often confused. In secular usage, it is an obsolete term for any sink or basin for washing hands, especially in a lavatory.

Maundy, or the Washing of the Feet, or Pedelavium, is a religious rite observed by various Christian denominations. The Latin word mandatum is the first word sung at the ceremony of the washing of the feet, "Mandatum novum do vobis ut diligatis invicem sicut dilexi vos", from the text of John 13:34 in the Vulgate. This is also seen as referring to the commandment of Christ that believers should emulate his loving humility in the washing of the feet. The term mandatum, therefore, was applied to the rite of foot-washing on the Thursday preceding Easter Sunday, called Maundy Thursday.

A piscina is a shallow basin placed near the altar of a church, or else in the vestry or sacristy, used for washing the communion vessels. The sacrarium is the drain itself. Anglicans usually refer to the basin, calling it a piscina. For Roman Catholics sacrarium is “special sink used for the reverent disposal of sacred substances. This sink has a cover, a basin, and a special pipe and drain that empty directly into the earth, rather than into the sewer system” . Precious or sacred items are disposed of, when possible, by returning them to the ground. They are in some cases used to dispose of materials used in the sacraments and water from liturgical ablutions. They are found in Roman Catholic, Anglican, and Lutheran churches, and a similar vessel is used in Eastern Orthodox churches.

Washing and anointing is a temple ordinance practiced by The Church of Jesus Christ of Latter-day Saints and Mormon fundamentalists as part of the faith's endowment ceremony. It is a sacred ordinance for adults, similar to chrismation, usually performed at least a year after baptism. The ordinance is performed by the authority of the Melchizedek priesthood by an officiator of the same gender as the participant.