The Queen Mary Psalter (British Library, Royal MS 2 B.vii) is a fourteenth-century English psalter named after Mary I of England, who gained possession of it in 1553. The psalter is noted for its beauty and the lavishness of its illustration, and has been called "one of the most extensively illustrated psalters ever produced in Western Europe" and "one of the choicest treasures of the magnificent collection of illuminated MSS. in the British Museum".