Maurice le Brun, 1st Baron Brun (bef. 1279 – 17 March 1354/1355) was an English peer, born in Essex. Sir Maurice le Brun was the son of William le Brun of , Dorset, of Rowner, Hampshire, and of Fordingbridge, Hampshire, who died circa 4 March 1300/1301, and wife Isolde, family unknown, who died circa 6 September 1307. He married before 14 October 1300 , whom he survived, born in Ireland on 9 October 1286 the daughter of Philip de la Rokele of Beckenham, Kent, and of South Ockendon, Essex, and wife Joan, family unknown. On 26 June 1301 she and her husband had livery of her father's lands.