Abingdon Abbey (formally Abbey of Saint Mary) was a Benedictine monastery in Abingdon-on-Thames in the modern county of Oxfordshire in the United Kingdom. Situated near to the River Thames, it was founded in c.675 AD and was dedicated to Mary, mother of Jesus. It was disestablished in 1538 during the dissolution of the monasteries. A few physical remnants of the Abbey buildings survive within Abingdon-on-Thames.

The abbey is thought to have been founded in 675 either by Cissa, viceroy of Centwine, king of the West Saxons, or by his nephew Hean, in honour of the Virgin Mary, for twelve Benedictine monks. Cissa was buried here, as well.

Endowed by successive West Saxon kings, it grew in importance and wealth until its destruction by the Danes in the reign of King Alfred, and the sequestration of its estates by Alfred because the monks had not made him a sufficient requital for vanquishing their enemies. By the 950s the abbey was in a decayed state, but in about 954 King Eadred appointed Æthelwold, later Bishop of Winchester, abbot. He was one of the leaders of the English Benedictine Reform, and Abingdon then became the second centre of the Reform (after Glastonbury). There is a collection of 136 charters granted to this abbey by various Saxon kings. The Domesday Book of 1086 states that the abbey was a wealthy and powerful landowner.

The Chronicle of the Monastery of Abingdon (Historia Ecclesie Abbendonensis) was written at the abbey in the twelfth century.

In Sutton Courtenay, Abingdon Abbey constructed The Abbey as a monastic grange, used as an administrative centre for the abbey's land and tithe holdings. However, the owner of the hide of land, Alwin the priest (whose father owned the land before him ), agreed with the abbot that he should retain Sutton with reversion first to his son and thereafter to the abbey, on condition of giving in Milton chapelry immediately. Almost certainly in the late twelfth century, Abingdon Abbey took two thirds of the tithes and the rector the remaining third. In 1258, following a dispute, the land was formally appropriated to the abbey and a vicarage was ordained. As it was close to Abingdon Abbey, it was probably run by the monks themselves rather than being left to a steward. In 1278, however, Hugh de Courtenay, Lord of the Manor of Sutton, sued the abbey for advowson. An allegedly biased jury was impanneled and in 1284 it found unexpectedly for Courtenay. Solomon of Rochester, the chief justice of the eyre, who presided over the jury, was the first to be partitioned by the Courtenays. The abbot of Abingdon Abbey alleged that in 1290, Solomon of Rochester had seized the goods in it belonging to the abbey. He also claimed that Solomon had extorted 40 marks from the abbey for alleged dilapidations to the rectory house. He was not convicted of any offence.

Abbots after the Norman Conquest included Faritius, physician to Henry I of England (1100–17), and Richard of Hendred, for whose appointment the King's consent was obtained in 1262. He was present at the Council of Lyon in 1272. The last abbot was Thomas Pentecost alias Rowland, who was among the first to acknowledge the Royal Supremacy. With the rest of his community he signed the surrender of his monastery in 1538, receiving the manor of Cumnor for life or until he had preferment to the extent of £223 per annum. The revenues of the abbey (26 Hen. VIII) were valued at £1876, 10s, 9d.

Ælfric of Abingdon was originally buried here, before being translated to Canterbury Cathedral. Sideman (bishop) was buried here, too, as were Margaret, Countess of Pembroke, and Fulk FitzRoy.

Other burials

• Robert D'Oyly and his wife Ealdgyth
• Siward (Abbot of Abingdon)
• Ralph Basset and his father Thurston Ralph Bassett
• John Grey, 2nd Viscount Lisle
• Margaret, Countess of Pembroke
• Mary of Waltham

There is nothing to see today of the abbey church. Apparent ruins in the Abbey Gardens are Trendell's Folly, built in the nineteenth century. Some of the stones may come from St Helen's Church.

Associated monastic buildings do, however, survive, including the Abbey Exchequer, the timber-framed Long Gallery, the abbey bakehouse, (all in the care of the Friends of Abingdon Civic Society) the abbey gateway, St John's hospitium (pilgrims' hostel) and the Church of St Nicolas. One of the original fireplaces was removed and is now still intact in Lacies Court, Abingdon School.

The existing buildings include:

• Checker Hall (Unicorn Theatre)
• The Checker.
• The Long Gallery.
• The Lower Hall.
• Thames Street, the Mill and the Mill stream.

• Abbot of Abingdon
• Abingdon Monks' Map
• Cosener's House, a conference centre in the grounds of the abbey
• Abingdon School

• Aveling, Francis (1913). Catholic Encyclopedia, Volume 1 - Abbey of Abingdon. Catholic Encyclopedia.
• Higham, Nicholas J.; Ryan, Martin J. (2015). The Anglo-Saxon World. Yale University Press. ISBN 978-0-300-21613-4.
• Preston, A.E. (1919). "Sutton Courtenay and Abingdon Abbey" (PDF). Berkshire, Buckinghamshire, and Oxfordshire Archaeological Journal. XXV. Retrieved 1 August 2022.

•  This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Abbey of Abingdon". Catholic Encyclopedia. New York: Robert Appleton Company.

• Abingdon Abbey Buildings The Friends of Abingdon Abbey Buildings Trust

• Abingdon (St Mary), abbey of Open Domesday

• Sutton Courtenay Open Domesday

51°40′14″N 1°16′31″W / 51.67056°N 1.27528°W / 51.67056; -1.27528