Hennell is a surname, and may refer to:

• Caroline Hennell, married name Caroline Bray, known as Cara Bray (1814–1905), British writer
• Charles Christian Hennell (1809–1850), British merchant and Christian apologist, brother of Caroline, Mary and Sara
• Henry Hennell (c.1797–1842), British chemist
• Mary Hennell (1802–1843), British writer
• Michael Hennell (born 1940), British computer scientist
• Thomas Hennell (1903–1945), British artist and writer
• Sara Hennell (1812–1899), British writer
• Hennell (1817 cricketer) (fl. 1817), English first-class cricketer for Marylebone Cricket Club

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