The Eadwine Psalter or Eadwin Psalter is a heavily illuminated 12th-century psalter named after the scribe Eadwine, a monk of Christ Church, Canterbury, who was perhaps the "project manager" for the large and exceptional book. The manuscript belongs to Trinity College, Cambridge and is kept in the Wren Library. It contains the Book of Psalms in three languages: three versions in Latin, with Old English and Anglo-Norman translations, and has been called the most ambitious manuscript produced in England in the twelfth century. As far as the images are concerned, most of the book is an adapted copy, using a more contemporary style, of the Carolingian Utrecht Psalter, which was at Canterbury for a period in the Middle Ages. There is also a very famous full-page miniature showing Eadwine at work, which is highly unusual and possibly a self-portrait.

A psalter is a volume containing the Book of Psalms, often with other devotional material bound in as well, such as a liturgical calendar and litany of the Saints. Until the emergence of the book of hours in the Late Middle Ages, psalters were the books most widely owned by wealthy lay persons. They were commonly used for learning to read. Many Psalters were richly illuminated, and they include some of the most spectacular surviving examples of medieval book art.