Hatt is a surname. Notable people with the surname include:

Richard Hatt, businessman, judge and political figure in Upper Canada Emilie Demant Hatt (1873–1958), Danish artist Gudmund Hatt (1884–1960), Danish archaeologist Eliza Ruth Hatt (died 1892), mistress of William Henry Crossland and mother of his illegitimate son John Hatt, travel editor of Harper's and Queen, founder in 1982 of Eland Books Robert T. Hatt, naturalist and author, discoverer of Hatt's vesper rat Rona Hatt, Canada's first female chemical engineer.

Fictional characters Sir Topham Hatt, the Fat Controller of Thomas the Tank Engine

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