The Harley Psalter (British Library Harley MS 603) is an illuminated manuscript of the second and third decades of the 11th century, with some later additions. It is a Latin psalter on vellum, measures 380 x 310 mm and was probably produced at Christ Church, Canterbury. The most likely patron of such a costly work would have been the Archbishop of Canterbury at the time, possibly Æthelnoth, who was consecrated in 1020 and remained at Canterbury until 1038.