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

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