Thomas Eyre (died 22 February 1772) was an Irish military engineer. Thomas Eyre was the second son of Colonel Samuel Eyre of Eyreville, County Galway. In 1738 he joined the regiment of James Oglethorpe, the founder of the Colony of Georgia, and sailed to the colony. He rose from the rank of cadet to be sub-engineer for Georgia and South Carolina by 1743, when he left for England. As a lieutenant, Eyre joined Trelawney's Regiment of Foot, headed by Edward Trelawney, Governor of Jamaica. He served in Jamaica and at Roatán (Rattan), and was promoted to captain in 1748. Eyre retired from active duty in 1752.