Tillinghast is a surname. Notable people with the surname include:
A. W. Tillinghast (1874–1942), United States golf course architectCharles Carpenter Tillinghast, Jr. (1911–1998), American chairman of Trans World Airlines and chancellor of Brown UniversityCharles Foster Tillinghast, Jr. (1871–1948), yachtsman, winner of the 1935 Blue Water MedalJohn Tillinghast (1604–1655), British clergymanMary Tillinghast (f. 1690s), British food writerPardon Tillinghast (1622–1717), early American Baptist pastor and public officialRichard Tillinghast (born 1940), United States poetWallace Tillinghast (f. 1909–1910), United States man who falsely claimed to have invented a flying machineIt may also refer to a prominent Rhode Island political family, whose members include:
Charles Foster Tillinghast, Sr. (died 1864), founder of Tillinghast Licht law firmJoseph L. Tillinghast (1791–1844), United States political figure from Rhode IslandThomas Tillinghast (1842–1921), United States political figure from Rhode Island