Thomas Clark may refer to:
T. H. Clark (1893–1996), American/Canadian geologist
Thomas Clark (Upper Canada) (died 1835), Canadian businessman and political figure
Thomas Clark (composer) (1775–1859), composer of West Gallery music
Thomas Clark (chemist) (1801–1867), British chemist
Thomas Clark (North Carolina) (1741–1792), American officer of the American Revolutionary War
Sir Thomas Clark (1823–1900), Lord Provost of Edinburgh 1865–1888
Thomas J. Clark (1869–1907), American inventor
Thomas D. Clark (1903–2005), Kentucky historian
Thomas M. Clark (1812–1903), American Episcopal presiding bishop
Thomas Clark (Long Beach), Mayor of Long Beach, California, 1975–1980, and 1982–1984
Thomas Clark (cricketer), eighteenth-century cricketer
Thomas Alonzo Clark (1920–2005), U.S. federal judge
Thomas Arkle Clark (1862–1932), American academic
Thomas Brown Clark (1895–1983), Scottish painter
Thomas Clark (writer) (born 1980), Scottish writer