The Book of Kells is an illuminated manuscript and Celtic Gospel book in Latin, containing the four Gospels of the New Testament together with various prefatory texts and tables. It was created in a Columban monastery in either Ireland or Scotland, and may have had contributions from various Columban institutions from each of these areas. It is believed to have been created c. 800 AD. The text of the Gospels is largely drawn from the Vulgate, although it also includes several passages drawn from the earlier versions of the Bible known as the Vetus Latina. It is regarded as a masterwork of Western calligraphy and the pinnacle of Insular illumination. The manuscript takes its name from the Abbey of Kells, County Meath, which was its home for centuries.

An illuminated manuscript is a formally prepared document where the text is decorated with flourishes such as borders and miniature illustrations. Often used in the Roman Catholic Church for prayers and liturgical books such as psalters and courtly literature, the practice continued into secular texts from the 13th century onward and typically include proclamations, enrolled bills, laws, charters, inventories, and deeds.