Peterborough Cathedral, properly the Cathedral Church of St Peter, St Paul and St Andrew, and formerly known as Peterborough Abbey or St Peter's Abbey, is a cathedral in Peterborough, Cambridgeshire, in the United Kingdom. The seat of the Anglican Bishop of Peterborough, it is dedicated to the Apostles Saint Peter, Saint Paul, and Saint Andrew, whose statues look down from the three high gables of the West Front. Founded in the Anglo-Saxon period as a minster it became one of England's most important Benedictine abbeys, becoming a cathedral only in 1542. Its architecture is mainly Norman, following a rebuilding in the 12th century. Alongside the cathedrals of Durham and Ely, it is one of the most important 12th-century buildings in England to have remained largely intact, despite extensions and restoration, and is one of the nation's best preserved pre-Reformation abbeys.

Peterborough Cathedral is known for its imposing Early English Gothic West Front (façade) which, with its three enormous arches, is without architectural precedent and with no direct successor. The appearance is slightly asymmetrical, as one of the two towers that rise from behind the façade was never completed (the tower on the right as one faces the building), but this is only visible from a distance.

The original church, known as "Medeshamstede", was founded in the reign of the Anglo-Saxon King Peada of the Middle Angles in about 655 AD, as one of the first centres of Christianity in central England. The monastic settlement with which the church was associated lasted at least until 870, when it was supposedly destroyed by Vikings. In an alcove of the New Building, an extension of the eastern end, lies an ancient stone carving: the Hedda Stone. This medieval carving of 12 monks, six on each side, commemorates the destruction of the Monastery and the death of the Abbot and Monks when the area was sacked by the Vikings in 864. The Hedda Stone was likely carved sometime after the raid, when the monastery slipped into decline.

In the mid-10th century, monastic revival (during which churches at Ely and Ramsey were also refounded) a Benedictine Abbey was created and endowed in 966, principally by Athelwold, Bishop of Winchester, from what remained of the earlier church, with "a basilica [church] there furbished with suitable structures of halls, and enriched with surrounding lands" and more extensive buildings which saw the aisle built out to the west with a second tower added. The original central tower was, however, retained. It was dedicated to St Peter and surrounded by a palisade, called a burgh, hence the town surrounding the abbey was eventually named Peter-burgh. The community was further revived in 972 by Dunstan, Archbishop of Canterbury.

This newer church had as its major focal point a substantial western tower with a "Rhenish helm" and was largely constructed of ashlars.^{[citation needed]} Only a small section of the foundations of the Anglo-Saxon church remain beneath the south transept but there are several significant artefacts, including Anglo-Saxon carvings such as the Hedda Stone, from the earlier building.

In 2008, Anglo-Saxon grave markers were reported to have been found by workmen repairing a wall in the cathedral precincts. The grave markers are said to date to the 11th century, and probably belonged to "townsfolk".

Although damaged during the struggle between the Norman invaders and local folk-hero, Hereward the Wake, it was repaired and continued to thrive until destroyed by an accidental fire in 1116. This event necessitated the building of a new church in the Norman style, begun by Abbot John de Sais on 8 March 1118 (Old Style). By 1193, the building was completed to the western end of the Nave, including the central tower and the decorated wooden ceiling of the nave. The ceiling, completed between 1230 and 1250, still survives. It is unique in Britain and one of only four such ceilings in the whole of Europe. It has been over-painted twice, once in 1745, then in 1834, but still retains the character and style of the original. (The painted nave ceiling of Ely Cathedral, by contrast, is entirely a Victorian creation.)

The church was largely built of Barnack limestone from quarries on its own land, and it was paid annually for access to these quarries by the builders of Ely Cathedral and Ramsey Abbey in thousands of eels (e.g. 4,000 each year by Ramsey). Cathedral historians believe that part of the placing of the church in the location it is in is due to the easy ability to transfer quarried stones by river and then to the existing site allowing it to grow without being relocated.