Sir Walter Bentley (died 1359) was an English knight who fought during the Hundred Years' War.

Bentley held many lands in England, as well as in Brittany and France such as: Beauvoir-sur-Mer, Ampant, Barre, Blaye, Chateauneuf, Villemaine, the Île-Chauvet and islands of Noirmoutier and Bouin.

Caours is also said to have subsequently arranged an ambush of the then English Lieutenant of Brittany, Sir Thomas Dagworth in 1350.

Returning to Brittany, Walter raised an English-Breton army and defeated Guy II during the battle of Mauron.

Later that same year, Edward III ordered Bentley to surrender his wife's castles, part of a treaty with Charles, Duke of Brittany.