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Jon can refer to:
- Jon Snow, formerly the Warden of the North pledged to claimant Queen Daenerys Targaryen, before that King in the North, and before that, the 998th Lord Commander of the Night's Watch.
- Jon Arryn, Hand of the King to Robert Baratheon, killed by his wife Lysa at the orders of Petyr Baelish.
- Greatjon Umber, the head of House Umber, Lord of Last Hearth and a loyal ally of House Stark, died during the War of The Five Kings.
- Smalljon Umber, the head of House Umber after his father's death, died while fighting in the Battle of the Bastards.
- Jon Connington, Hand of the King to Aerys II Targaryen and the head of House Connington.
- Jon Karstark, a member of House Karstark.
- Jon Stark, a King in the North of House Stark before the War of Conquest.