Thomas Hay

Thomas Hay may refer to:
 * Thomas Hay (bishop), 15th-century Scottish prelate
 * Thomas de la Hay (c. 1342–1406), Scottish baron and soldier
 * Thomas Hay, 9th Earl of Kinnoull (1710–1787), Scottish MP
 * Thomas Hay (Canadian politician) (1872–1939), Canadian politician
 * Thomas William Hay, British Member of Parliament for South Norfolk, 1922–1923
 * Thomas Hay (Lewes MP) (1733–1796), British Army officer and politician
 * Thomas Hay, 7th Earl of Kinnoull (1660–1719), Scottish peer and Conservative politician