Hugh de Grandmesnil (1032 – 22 February 1098),[1] (known in French as Hugues and Latinised as Hugo de Grentmesnil, aliter Grentemesnil, etc.), is one of the proven companions of William the Conqueror known to have fought at the Battle of Hastings in 1066. Subsequently, he became a great landowner in England.
He was the elder son of Robert I of Grandmesnil by his wife Hawise d'Echaffour, a daughter of Giroie, Lord of Échauffour. His younger brother was Robert II of Grandmesnil.
Following the Norman Conquest King William the Conqueror gave Hugh 100 manors in recompense for his service, sixty-five of them in Leicestershire, in the Midlands. He was appointed Sheriff of Leicestershire and Governor of Hampshire. Hugh's landholdings are listed in the Domesday Book of 1086 ([2] p 652-6).