The dalmatic is a long, wide-sleeved tunic, which serves as a liturgical vestment in the Catholic, Lutheran, Anglican, United Methodist, and some other churches. When used, it is the proper vestment of a deacon at Mass, Holy Communion or other services such as baptism or marriage held in the context of a Eucharistic service. Although infrequent, it may also be worn by bishops above the alb and below the chasuble, and is then referred to as pontifical dalmatic.

Like the chasuble worn by priests and bishops, it is an outer vestment and is supposed to match the liturgical colour of the day. The dalmatic is often made of the same material and decoration as a chasuble, so as to form a matching pair. Traditional Solemn Mass vestment sets include matching chasuble, dalmatic, and tunicle.

A dalmatic is also worn by the British monarch during the Coronation service.