Tillinghast is a surname. Notable people with the surname include:
A. W. Tillinghast (1874–1942), United States golf course architect
Charles Carpenter Tillinghast, Jr. (1911–1998), American chairman of Trans World Airlines and chancellor of Brown University
Charles Foster Tillinghast, Jr. (1871–1948), yachtsman, winner of the 1935 Blue Water Medal
John Tillinghast (1604–1655), British clergyman
Mary Tillinghast (f. 1690s), British food writer
Pardon Tillinghast (1622–1717), early American Baptist pastor and public official
Richard Tillinghast (born 1940), United States poet
Wallace Tillinghast (f. 1909–1910), United States man who falsely claimed to have invented a flying machine
It may also refer to a prominent Rhode Island political family, whose members include:
Charles Foster Tillinghast, Sr. (died 1864), founder of Tillinghast Licht law firm
Joseph L. Tillinghast (1791–1844), United States political figure from Rhode Island
Thomas Tillinghast (1842–1921), United States political figure from Rhode Island
