Thomas Welch (1742–1816) was a surveyor and judge in Upper Canada
Thomas Welch may also refer to:
Thomas Bramwell Welch (1825–1903), discoverer of the pasteurization process to prevent the fermentation of grape juice Thomas Welch (American football) (born 1987), NFL offensive tackle Thomas Welch (cricketer) (1906–1972), English cricketer Thomas Anthony Welch (1884–1959), American prelate of the Roman Catholic Church Thomas Vincent Welch (1850–1903), New York State Assemblyman Tom Welch (politician), American politician in Montana Tom Welch (curler) in WFG Tankard
See also Thomas Welsh (disambiguation) Thomas Walsh (disambiguation)