Robert Bastard (fl.1086) (also known as Robert le Bastard, Latinised as Rotbertus / Robertus Bastardus) was a Norman warrior who assisted in the 1066 Norman Conquest of England under King William the Conqueror. He was subsequently rewarded with landholdings in Devonshire and is one of the Devon Domesday Book tenants-in-chief of that monarch, with a holding of 10 manors or estates held in chief, 8 of which he held in demesne, i.e. under his own management without tenants. He had at least one further holding as a mesne tenant, at Goosewell, Plymstock parish, Plympton hundred, held from William of Poilley, a Norman tenant-in-chief from Poilley in Normandy, most of whose 21 landholdings were later granted by King Henry I (1100–1135) to his trusted supporter Richard de Redvers (died 1107), feud