Dunnett is a surname. Notable people with the surname include:
- Sir Alastair Dunnett (1908–1998), Scottish journalist and newspaper editor, husband of Dorothy Dunnett
- Charles Dunnett (1921-2007), Canadian statistician
- Dorothy Dunnett (1923–2001), Scottish historical novelist, wife of Alastair Dunnett
- Jack Dunnett (1922–2019), British politician
- Stephen Dunnett (born 1950), British neuroscientist
- Jonathan Dunnett (born 1974), British adventurer, windsurfing the mainland coastline of Europe
- Sir James Macdonald Dunnett, Indian civil servant
- Sir James Ludovic Dunnett, British civil servant