The mitre (British English) (/ˈmtər/; Greek: μίτρα, "headband" or "turban") or miter (American English; see spelling differences), is a type of headgear now known as the traditional, ceremonial headdress of bishops and certain abbots in traditional Christianity. Mitres are worn in the Catholic Church, Orthodox Church, as well as in the Anglican Communion, some Lutheran churches, and also by bishops and certain other clergy in the Eastern Catholic Churches and the Oriental Orthodox Churches. The Metropolitan of the Malankara Mar Thoma Syrian Church also wears a mitre during important ceremonies such as the Episcopal Consecration.

Western and Eastern-styled mitres
A Catholic mitre from the 19th century, displayed in the Museo dell'Opera del Duomo in Pisa, Italy
Western and Eastern-styled mitres worn by bishops
Catholic Archbishop José Palma in Western-styled pontifical vestments, including a mitre
Ukrainian Orthodox Bishop Alexander (Drabinko) wearing Eastern-styled vestments, including a mitre