Gundred or Gundreda (Latin: Gundrada) (died 27 May 1085) was the Flemish-born wife of an early Norman baron, William de Warenne, 1st Earl of Surrey. She and her husband established Lewes Priory in Sussex.
Gundred was almost certainly born in Flanders, and was a sister of Gerbod the Fleming, 1st Earl of Chester. She is explicitly so called by Orderic Vitalis, as well as the chronicle of Hyde Abbey. She was also the sister of Frederick of Oosterzele-Scheldewindeke, who was killed c.1070 by Hereward the Wake.
Gundred married before 1070William de Warenne, 1st Earl of Surrey (d. 20 June 1088), who rebuilt Lewes Castle, making it his chief residence. Sometime between 1078 and 1082, Gundred and her husband set out for Rome, visiting monasteries along the way. In Burgundy they were unable to go any further due to a war between Henry IV and Pope Gregory VII. They visited Cluny Abbey and were impressed with the monks and their dedication. William and Gundred decided to found a Cluniac priory on their own lands in England. They sent to Hugh, the abbot of Cluny, for monks to come to England at their monastery. Hugh was reluctant yet eventually sent several monks, including Lazlo, who became the first abbot. The house they founded was Lewes Priory, dedicated to St. Pancras. Gundred died in childbirth on 27 May 1085 at Castle Acre, Norfolk, one of her husband's estates, and was buried at the Chapter house of Lewes Priory. He was later buried beside her.
In the course of the centuries which followed, both tombstones disappeared from the priory. In 1774 Edward Clarke discovered Gundred's in Isfield Church (seven miles from Lewes), over the remains of Edward Shirley, Esq., who died in 1550. William Burrell had it removed on 2 October 1775 to St. John's Church, Southover, where it was placed on display.