(banns) A religious tradition by which engaged couples had to announce their intention to marry. This announcement allowed anyone in the congregation to voice their protest. The marriage banns normally took place a few weeks before the actual marriage date. In many churches, they banns were read aloud on three successive Sundays.

The banns of marriage, commonly known simply as the "banns" or "bans" /ˈbænz/ (from a Middle English word meaning "proclamation", rooted in Frankish and from there to Old French), are the public announcement in a Christian parish church or in the town council of an impending marriage between two specified persons. It is commonly associated with the Catholic Church, the Church of England, and the Church of Sweden, and with other denominations whose traditions are similar. In 1983, the Roman Catholic Church removed the requirement for banns and left it to individual national bishops' conferences to decide whether to continue this practice, but in most Catholic countries the banns are still published.

The purpose of banns is to enable anyone to raise any canonical or civil legal impediment to the marriage, so as to prevent marriages that are invalid. Impediments vary between legal jurisdictions, but would normally include a pre-existing marriage that has been neither dissolved nor annulled, a vow of celibacy, lack of consent, or the couple's being related within the prohibited degrees of kinship.