Sir James Hamilton of Finnart (c. 1495 – 16 August 1540) was a Scottish nobleman and architect, the illegitimate son of James Hamilton, 1st Earl of Arran, and Marion Boyd of Bonshaw.Although legitimated in 1512 while still a minor, he continued to be known as the "Bastard of Arran". As a key member of the Hamilton family, and second cousin of James V, King of Scotland, he became a prominent member of Scottish society.