Sir John Hamilton of Cadzow, 4th Laird of Cadzow (b. bef. 1370 – d. c. 1402) was a Scottish nobleman and soldier.
He succeeded his father, DaCadzow, no later than 1392, when he appears on a charter of Andrew Murray of Touchadam as Dominus.
He was imprisoned, along with his brothers William and Andrew, in Norwich in 1396. Richard II of England ordered their release from the Mayor and bailies of that city on 29 June. It appears that their imprisonment was due to violations of the truce between the Kingdoms of England and Scotland. John Hamilton, brother of John Hamilton of either feeling Bardowi, then the uncle of John Hamilton of Fingalto, was released from the Tower of London on the same date.
A John Hamilton, either his brother John Hamilton of Bardowie, or uncle John Hamilton of Fingalton, was released from the Tower of London on the same date. Hamilton and his uncle seem to have found themselves guests of the English again.