Baron St John de/of Basing is a title that has been created twice in the Peerage of England. On 29 December 1299 John St John was summoned to parliament. On the death of the third baron the barony fell into abeyance in 1347. Only fourteen years later, the abeyance was terminated in favour of Isabel Poynings, née St John, in whose right Lucas de Poynings, her husband, was summoned. And at the death of the fifth baron, who was the son-in-law of the third Earl of March, the barony fell into abeyance again.