Humphrey III de Bohun (before 1144 – ? December 1181) was an Anglo-Norman nobleman and general who served Henry II as Constable. He was the son of Humphrey II de Bohun and Margaret of Hereford, the eldest daughter of the erstwhile constable Miles of Gloucester. He had succeeded to his father's fiefs, centred on Trowbridge, by 29 September 1165, when he owed three hundred marks as relief. From 1166 onwards, he held his mother's inheritance, both her Bohun lands in Wiltshire and her inheritance from her late father and brothers.
As his constable, Humphrey sided with the king during the Revolt of 1173–1174. In August 1173, he was with Henry and the royal army at Breteuil on the continent and, later that same year, he and Richard de Lucy led the sack of Berwick-upon-Tweed and invaded Lothian to attack William the Lion, the King of Scotland, who had sided with the rebels. He returned to England and played a major role in the defeat and capture of Robert Blanchemains, the Earl of Leicester, at Fornham. By the end of 1174, he was back on the continent, where he witnessed the Treaty of Falaise between Henry and William of Scotland.