Hamnett is a surname. Notable people with the surname include:
Ade Hamnett (1882–1956), English footballer
Belinda Hamnett (born 1975), Hong Kong actress and model
Bob Hamnett (1889–1967), English footballer
Cyril Hamnett, Baron Hamnett (1906–1980), British journalist and politician
Katharine Hamnett (born 1947), English fashion designer
Nina Hamnett (1890–1956), Welsh artist and writer
Olivia Hamnett (died 2001), English actress
