Thomas Fleming, Earl of Wigtown (b. 1363 x 1367-1372; d. c. 1382) was the second person to hold the title earl of Wigtown. He was the grandson of the previous earl, Sir Malcolm Fleming, through the latter's only son John (d. 1351). His mother was a woman named Marjorie. Thomas thus had the unusual fortune of being demoted from the rank of a magnate to that of a baron. Thomas subsequently seems to have given away just about all of his remaining lands. He died without issue sometime in or before 1382.