Jon can refer to:
- King Jon Snow, currently the head of House Stark and King in the North after successfully defeating House Bolton and restoring House Stark's dominion over The North.
- 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.