Arnot is a surname. Notable people with the surname include:
Hugo Arnot of Balcormo (1749-1786), Scottish advocate, writer and campaigner
Frederick Stanley Arnot, Scottish missionary to Africa
Madeleine Arnot, sociologist
Blair Arnot, skateboarder
David Arnot, Scottish divine
John Arnot, Jr., US politician
Robert Page Arnot, British Communist politician