The calendar of saints is a traditional Christian method of organising a liturgical year on the level of days by associating each day with one or more saints, and referring to the day as that saint's day. The system arose from the very early Christian custom of annual commemoration of martyrs on the dates of their deaths ( Dies Natalis ). As the number of recognized saints increased during Late Antiquity and roughly the first half of the Middle Ages, eventually every day of the year had at least one saint who was commemorated on that date.
The Church of England commemorates many of the same saints as those in the Roman Catholic calendar of saints, mostly on the same days, but also commemorates various notable (often post-Reformation) Christians who have not been canonised, with a particular though not exclusive emphasis on those of English origin. There are differences in the calendars of other churches of the Anglican Communion (see Saints in Anglicanism).
The Lutheran Calendar of Saints is a listing which details the primary annual festivals and events that are celebrated liturgically by the Lutheran Church. The calendar of the Evangelical Lutheran Church in America (and largely the one given below) is from Evangelical Lutheran Worship published in 2006 as a replacement for the 1978 Lutheran Book of Worship. The elements of the calendar unique to the Lutheran Church - Missouri Synod are from the Lutheran Service Book.