John Campbell, Earl of Atholl (died 1333) was a Scottish nobleman.
John, also known as Iain, was the son of Sir Neil Campbell by his wife Mary Bruce.
He was married to Joan, former wife of Malise IV, Earl of Strathearn and daughter of Sir John de Menteith.
They had no children, so when he was killed at Halidon Hill on 19 July 1333 (one of five Scottish earls to die in the battle), his earldom became extinct.
David III Strathbogie, a disinherited noble, thus claimed the Earldom of Atholl outright.