Hartt is a surname. Notable people with the surname include:
Cecil Hartt (1884–1930), Australian cartoonist
Charles Frederick Hartt (1840–1878), Canadian-American geologist, paleontologist and naturalist
Dale Hartt (born 1979), American mixed martial artist
Edmund Hartt, American shipbuilder
James Irwin Hartt (1867 – after 1919), Canadian politician
Frederick Hartt (1914–1991), American art historian
Maurice Hartt (1895–1950), Romanian-born Canadian politician
Reg Hartt (born 1946), Canadian film archivist and critic
Rollin Lynde Hartt (1869–1946), American journalist
Stanley Hartt (born 1937), Canadian lawyer and businessman
Thomas Aaron Hartt (1858–1930), Canadian politician
Hartt may also refer to:
The Hartt School, the comprehensive performing arts conservatory of the University of Hartford located in West Hartford, Connecticut, United States, that offers degree programs in music, dance, and theatre
