Sir George Hamilton of Greenlaw and Roscrea (died before 1657) was an undertaker in the Plantation of Ulster. Born and bred in Scotland, by 1611 he had moved to Ireland with his Scottish wife to occupy his plantation grant. In 1630 he married his second wife and moved to Roscrea in southern Ireland, which his father-in-law, Walter Butler, 11th Earl of Ormond, leased to him in lieu of dowry.