John de Warenne, 6th Earl of Surrey (123127 September 1304) was a prominent English nobleman and military commander during the reigns of Henry III of England and Edward I of England. During the Second Barons' War he switched sides twice, ending up in support of the king, for whose capture he was present at Lewes in 1264. Warenne was later appointed a Guardian of Scotland and featured prominently in Edward I's wars in Scotland.