Calendar of saints

The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the day as the feast day or feast of said saint. A feast is "an annual religious celebration, a day dedicated to a particular saint".

The system rose from the early Christian custom of commemorating each martyr annually on the date of their death, their birth into heaven, a date therefore referred to in Latin as the martyr's dies natalis ('day of birth'). Varying practices among Christian churches and denominations include how saints' days are ranked according to their importance.