Thomas Halsey may refer to:Thomas Halsey (1655–1715), English MP for Hertfordshire 1685, 1695, 1698, 1701–05, 1708 Thomas Halsey (c.1731–1788), English MP for Hertfordshire 1768–84 Thomas Plumer Halsey (1815–1854), MP for Hertfordshire 1846–54 Frederick Halsey, son of Thomas Plumer Halsey, MP for Hertfordshire 1874–85 and Watford 1885–1906 Thomas Jefferson Halsey (1863–1951), United States Representative from Missouri Sir Thomas Halsey, 3rd Baronet (1898–1970), English cricketer and Royal Navy officer, grandson of Sir Thomas Frederick Halsey Thomas Halsey (1591–1679) English immigrant to New York, co-founder of Southampton, New York