Matins (also Mattins) is a canonical hour in Christian liturgy, originally sung during the darkness of early morning.
The earliest use of the term was in reference to the canonical hour, also called the vigil, which was originally celebrated by monks from about two hours after midnight to, at latest, the dawn, the time for the canonical hour of lauds (a practice still followed in certain orders). It was divided into two or (on Sundays) three nocturns. Outside of monasteries, it was generally recited at other times of the day, often in conjunction with lauds.