Sir George Hay, 2nd Earl of Kinnoull, PC (1596 – 5 October 1644), styled Lord Kinfauns between 1621 and 1634,[2][3] was a Scottish peer, military officer, and political official.

[4] He was a member of the Privy Council, and served as Captain of the Yeomen of the Guard from 1632 to 1635.

He was fiercely loyal to as a loyalist to King Charles; he fought in the English Civil War, when he distinguished himself "by unshaken fidelity to his unfortunate sovereign, and gallant and active services as a soldier in his cause.

His older brother, Sir Peter Hay, died unmarried in 1621, leaving George to succeed to the earldom.

In 1622, he married Ann, eldest daughter of William Douglas, 7th Earl of Morton.