Thomas Maclellan may refer to:
Thomas Maclellan of Bombie (died 1597), Provost of Kirkcudbright Thomas Maclellan, 2nd Lord Kirkcudbright (died 1647), Scottish nobleman, grandson of the above
See also A. Thomas McLellan (born 1949), psychologist Thomas N. McClellan (1853–1906), associate justice and chief justice of the Supreme Court of Alabama
MacLellan (surname)