The Book of Common Prayer (BCP) is the name given to a number of related prayer books used in the Anglican Communion and by other Christian churches historically related to Anglicanism. The first prayer book, published in 1549 in the reign of King Edward VI of England, was a product of the English Reformation following the break with Rome. The work of 1549 was the first prayer book to include the complete forms of service for daily and Sunday worship in English. It contained Morning Prayer, Evening Prayer, the Litany, and Holy Communion and also the occasional services in full: the orders for Baptism, Confirmation, Marriage, "prayers to be said with the sick", and a funeral service. It also set out in full the "propers" : the introits, collects, and epistle and gospel readings for the Sunday service of Holy Communion. Old Testament and New Testament readings for daily prayer were specified in tabular format as were the Psalms and canticles, mostly biblical, that were provided to be said or sung between the readings.

A prayer book is a book containing prayers and perhaps devotional readings, for private or communal use, or in some cases, outlining the liturgy of religious services. Books containing mainly orders of religious services, or readings for them are termed "service books" or "liturgical books", and are thus not prayer-books in the strictest sense, but the term is often used very loosely. A religion's scriptures might also be considered prayer books as well.