John de Mohun, 1st Baron Mohun (died 1330), Lord of Dunster was an English noble.
He fought in the wars in Flanders and Scotland.
He was a signatory of the Baron's Letter to Pope Boniface VIII in 1301.
John was the eldest son of John de Mohun and Eleanor filias Reynold.
He was a signatory of the Baron's Letter to Pope Boniface VIII in 1301.