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An altar server is a lay assistant to a member of the clergy during a Christian religious service. An altar server attends to supporting tasks at the altar such as fetching and carrying, ringing the altar bell and so on.
Altar servers in the Catholic Church 
Formerly, only men and boys could serve at the altar, but canon 230 of the Code of Canon Law promulgated in 1983 allowed local ordinaries to permit girls and women to do so (see Female altar servers). In the United States, the Diocese of Lincoln, Nebraska has not granted permission. The priest in charge of a church is not obliged to avail of the permission, where granted. Traditionalist Catholic groups such as the FSSP and the Institute of Christ the King and some individual priests do not. The practice is also not accepted by those who act independently of the diocesan bishops, as is the case with the SSPX.
The term "acolyte" is sometimes applied to altar servers, but in the proper sense means someone who has been received the ministry of that name, usually reserved for those who are to be promoted to the permanent or transitory diaconate. These must receive the ministry of acolyte, which historically was classified as a minor order, at least six months before being ordained as deacons.
Duties at Mass (ordinary form of the Roman Rite) 
- Entrance: Servers are to act as thurifer with burning incense (if incense is used at the Mass), as bearers of lighted candles flanking another carrying the cross and as other participants in the entrance procession.
- Servers hold the liturgical books for the celebrant when he is not at the altar and is proclaiming the presidential prayers with outstretched hands. They bring and hold such things as books, thuribles, water and towel, plates, and microphones.
- Proclamation of the Gospel: At the preceding Alleluia or other chant, the thurible is presented to the priest for him to put incense in it, and then for the proclamation of the Gospel servers precede the priest or deacon to the ambo, perhaps carrying candles and incense.
- Beginning of the Liturgy of the Eucharist: Servers arrange the corporal, the purificator, the chalice, the pall, and the Missal on the altar, and then assist the priest in receiving the bread and wine and perhaps other gifts that are presented to him. They present the cruets of wine and water for the priest or deacon to pour some into the chalice. If incense is used, the thurible and incense are presented to the priest and, at least if there is no deacon, a server then incenses the priest and the people. When the priest then washes his hands standing at the side of the altar, a server pours the water over them.
- Consecration: A server rings a bell as a signal to the people shortly before the consecration and, where it is the local custom, rings the bell also when the priest displays the consecrated host and chalice to the people. If incense is used, a server incenses the host and the chalice while these are being shown.
- Sign of Peace: The servers receive the sign of peace from the priest or deacon within the sanctuary.
- Recessional: The servers accompany the priest as at the entrance procession.
Duties in the 1962 form 
- Mass of the Catechumens
- Processional: Servers carry the thurible, incense boat, processional cross and candles (flambeaux) in a Missa Cantata.
- After the sacristy bells are rung and first genuflection at the high altar, the server takes the priest's biretta, kisses it, and places on the Presidential Chair.
- Post-Epistle: Servers move Missal from Epistle side of the altar to the Gospel side of the altar.
- Mass of the Faithful
- Servers ring the altar bell once as the priest unveils chalice and places veil on altar.
- Preparation of the chalice: Servers present the cruets of water and wine for the deacon or priest to pour in the chalice.
- Lavabo: A server administers the water to the Priest as he ritually washes his hands.
- Beginning of the Sanctus: Altar bell is rung thrice.
- Canon of Mass: When the priest extends his hands over the chalice, serverds ring altar bell once, stand, take the bell, without genuflecting kneel on either side of the priest.
- Consecration: At each consecration servers make a deep bow at the priest's first genuflection, and ring the bell once. During each major elevation, servers kneel erect, raising the back of the chasuble and ringing the bell thrice. During the priest's second genuflection, servers release chasuble, make a deep bow and ring the bell once. After the consecration, holding the bell, servers return to their posts and kneel.
- Post Agnus Dei: Servers get patens from credence table and go back to posts with genuflections and kneeling. When the priest genuflects and says the triple "Domine, non sum dignus..." servers ring the bell thrice.
- Communion: Follow priest with paten in hand and hand over breast for the Communion.
- Ablutions: Get the water and wine cruets from credence table. For the first ablution at center of the altar, the server with the wine approaches as the priest tips the chalice toward the server. The server pours a little wine into the chalice, he bows and turns to his right and returns to the Epistle corner and wait for the priest. When the priest approaches for the second ablution, the server makes a moderate bow, pours a little wine over his fingers and then as much water as he desires. Then, with genuflections, switch the chalice veil from the Gospel side to the Epistle side with the Missal at the same time.
- Ending procession: Same as Processional.
While ordained and instituted ministers must wear an alb (with cincture and amice unless the form of the alb makes these unnecessary), albs or any other appropriate attire, such as a cassock and surplice, may be worn by servers. Black and red are the most common colours for a server's cassock, if used.
Eastern Orthodox and Eastern Catholic Churches 
In the Eastern Orthodox Church, altar servers assist the higher clergy during services. They might carry the cross, candles or liturgical fans in processions and entrances; maintain the censer, ensuring it has enough live charcoal, loading it with incense and handing it to the priest or deacon when required; preparing the hot water (zeon) in time for it to be added to the chalice at the Divine Liturgy; prepare the antidoron for the people to receive after Holy Communion; and any other necessary tasks so that the celebrant need not be distracted during the service. An altar server is vested in the sticharion only.
In the early Church, before someone could be a server he had to be tonsured. Nowadays, in many places it is not necessary to be tonsured before one is allowed to serve (since the tonsure must be done by a bishop or higher-ranking priest). The rites of "Setting Aside a Taper-bearer" and "Tonsuring a Reader" have now been combined into one service. It is the custom in some traditions, such as the Greek Orthodox or Melkite Catholic, to allow tonsured altar servers to also vest in the orarion, worn crossed over the back like that of a subdeacon but with the ends hanging parallel in front. Among the Russians, however, the orarion is not usually worn by servers, but only by duly ordained subdeacons and deacons, with the exception that laymen who are blessed to perform some of the functions of subdeacons may sometimes be blessed to wear the orar.
Before vesting, the server must fold his sticharion and bring it to the priest for him to bless. The priest blesses and lays his hand on the folded sticharion. The server kisses the priest's hand and the Cross on the vestment, and then withdraws to vest. Any server who has not been tonsured must remove the sticharion when he receives Holy Communion, because communicants receive the Mysteries according to their order within the Church (so tonsured clergy vest while laymen remove their vestments). Before divesting at the end of the service, the server must receive the priest's blessing.
The minimum age varies by local circumstance, but boys must be mature enough to carry out their duties without disrupting the sanctity of the altar. Although it is common in North America for boys to act as altar servers, in some places this practice is virtually unknown and these duties are always carried out by adult men. In other places where altar servers are normally boys, adult men will not vest if called upon to serve. In yet other places, boys are not permitted to serve in the Altar on reaching their teens on the grounds that the young man is no longer innocent enough to serve in the altar.
Altar servers, regardless of age, are subject to all the normal restrictions for those not of higher clerical position. Anyone who is bleeding, or has an open sore, is not permitted to enter the altar. They may not touch the altar table or anything on it under any circumstances, nor the prothesis without a blessing. They may not touch the sacred vessels, the chalice and diskos (paten) at any time. They may not stand directly in front of the altar table or pass between the front of it and the iconostasis, but must cross between the altar and the High Place if they need to move to the opposite side.
Women may not serve in the altar except in women's monasteries. In that case they do not receive the clerical tonsure (though they must be tonsured nuns), and do not vest in the sticharion, but wear their normal religious habit for attending services, and serve at a certain distance from the actual altar table. Normally, only older nuns may serve in the altar; but the Hegumenia (Abbess) is permitted to enter even if she is younger.
Other churches 
In Anglo-Catholic and some Episcopal Churches however, the vast majority of roles associated with an altar server are the same as those in the Catholic Church, and the same titles for each individual role are retained from Catholic tradition – mostly restored during the Oxford Movement in the 19th century.
- USATODAY.com - Neb. diocese is lone U.S. holdout on allowing altar girls
- canon 1035 of the Code of Canon Law
- General Instruction of the Roman Missal, no. 100
- General Instruction of the Roman Missal, no. 120
- Catholic Bishops' Conference of England & Wales, Celebrating the Mass: A Pastoral Introduction (Catholic Truth Society 2005), p. 19
- General Instruction of the Roman Missal, no. 132
- General Instruction of the Roman Missal, nos. 133, 175]
- General Instruction of the Roman Missal, no. 139
- General Instruction of the Roman Missal, no. 140
- General Instruction of the Roman Missal, no 142
- General Instruction of the Roman Missal, nos. 144, 178
- General Instruction of the Roman Missal, no. 145
- General Instruction of the Roman Missal, no. 150
- General Instruction of the Roman Missal, nos. 154, 181
- General Instruction of the Roman Missal, no. 169
- General Instruction of the Roman Missal, nos. 119, 336
|Wikimedia Commons has media related to: Altar servers|
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- SanctaMissa.org's Online Altar Server Tutorial with Video and Guides (1962 Roman Missal)
- Altar Server Guide
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- Official Website of the Ministry of Altar Servers San Roque Cathedral, Diocese of Caloocan, Philippines
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