Sir John Luttrell feudal baron of Dunster in Somerset, of Dunster Castle, was an English soldier, diplomat, and courtier under Henry VIII and Edward VI. He served under Edward Seymour, Earl of Hertford in Scotland and France. His service is commemorated in an allegorical portrait by Hans Eworth.

The feudal barony of Dunster was an English feudal barony with its caput at Dunster Castle in Somerset. During the reign of King Henry I (1100–1135) the barony comprised forty knight's fees and was later enlarged. In about 1150 the manors retained in demesne were Dunster, Minehead, Cutcombe, Kilton and Carhampton in Somerset, and Ham in Dorset.