John Thornton was an English cartographer during the second half of the 17th century. He worked as a hydrograph for the Hudson Bay Company and the East India Company. His works can be found in the following atlases:
- The English Pilot, the Third Book, 1703
- The English Pilot, the Fourth Book, 1689
- Atlas Maritimus, 1685, 1700, 1708.
- Hydrographia Galliae: The Sea Coasts of France, 1695