A churchwarden is a lay official in a parish or congregation of the Anglican Communion, Lutheran Churches or Catholic Church, usually working as a part-time volunteer. In the Anglican tradition, holders of these positions are ex officio members of the parish board, usually called a vestry, parochial church council, or in the case of a Cathedral parish the chapter. Historically, a churchwarden was responsible for maintaining the churchwardens' accounts of the parish's income and expenses.

Churchwardens have a duty to represent the laity and co-operate with the incumbent (or, in cases of vacancy, the bishop). They are expected to lead the parishioners by setting a good example and encouraging unity and peace. They have a duty to maintain order and peace in the church and churchyard at all times, and especially during services, although this task tends to be devolved to sidesmen.

Churchwardens in many parts of the Anglican Communion are legally responsible for all the property and movable goods belonging to a parish church. If so, they have a duty under ecclesiastical law to keep an up-to-date inventory of the valuables, and if applicable a "terrier of the property" (a listing and/or map of the church's lands, known as glebe, some of which may be let). Whenever churchwardens authorise work on the church building having obtained a faculty or to carry out work recommended in the church's Quinquennial Inspection Report, they must record this in the Church Logbook; it is inspected with the inventory. The churchwardens must ensure these logs are ready for inspection in case of a visitation and for periodic inspections. Churchwardens were also historically responsible for churchwardens' accounts, which detailed the expenses and income of parishes.

Priests and their equivalent tend to devolve day-to-day maintenance of church buildings and contents to their churchwardens.

If an incumbency is vacant, the bishop (or the Archdeacon acting on his behalf) will usually appoint the churchwardens as sequestrators of the parish until the bishop appoints a new incumbent. The sequestrators ensure that a minimum number of church services continue to be held in the parish, and in particular that the Eucharist continues to be celebrated every Sunday and on every Principal Feast. This duty is usually discharged by organising a regular rota of a few volunteer clergy from amongst either Non-Stipendiary Ministers from within that diocese or in some cases retired clergy living in or near the parish. The bishop will tend to consult the churchwardens before appointing a new priest to take over the parish; in England there is a set process to follow which also involves representatives of the congregation.

Churchwardens' duties may vary with the customs of the parish or congregation, the canons of the diocese to which the parish belongs, the desires of the priest, and the direction of the parish board or the congregation as a whole. A definition of their duties is that they are "ultimately responsible for almost everything in a church which does not have to be done by a priest. If the churchwarden does not do it himself, then he is responsible for making sure that it is done by someone".

In England, churchwardens have specific powers to enable them to keep the peace in churchyards.

The following are punishable with a £200 fine: