Bermondsey Abbey was an English Benedictine monastery. Most widely known as an 11th-century foundation, it had a precursor mentioned in the early eighth century, and was centred on what is now Bermondsey Square, the site of Bermondsey Market, Bermondsey, in the London Borough of Southwark, southeast London, England.
A monastery is known to have existed at Bermondsey before 715 AD, when it was a Surrey colony of the important Mercian monastery of Medeshamstede, later known as Peterborough. Though surviving only in a copy written at Peterborough in the 12th century, a letter of Pope Constantine (708-715) grants privileges to a monastery at Vermundesei. This monastery likely continued, probably as a secular minster, at least until the 9th-century Viking invasions.
Nothing more is heard of any church at Bermondsey until 1082, when, according to the "Annales Monasterii de Bermundeseia", a monastery was founded there by one Alwinus Child, with royal licence. Given the trend to continuity of sacred sites, this church most likely was founded on the site of the earlier monastery. This foundation possibly was a direct successor to the church last mentioned in the early 8th century.
Alwinus Child's new monastery, dedicated to St Saviour, is presumably identical with the 'new and handsome church' which appears in the Domesday Book record for Bermondsey, in 1086. In effect, Domesday Book clarifies the "Annales"' mention of royal licence, since it records that the estate of Bermondsey was then held by King William the Conqueror, a small part being also in the hands of Robert, Count of Mortain, the king's half brother, and younger brother of Odo of Bayeux, then earl of Kent. Royal support for the new foundation continued with King William Rufus' gift of the royal estate at Bermondsey, in either 1089 or 1090, and through further grants made, for example, by King Henry I in the 1120s and 1130s. The counts of Mortain maybe also maintained an interest in the new monastery, since Count William of Mortain became a monk there in 1140. Alwinus Child's only recorded gift to the new monastery was 'various rents in the city of London', and these may be represented in Domesday Book by mention of 13 burgesses there paying 44d (£0.18) annually to the estate at Bermondsey.