Mansergh is a surname. Notable people with the surname include: Aubrey Mansergh (1898–1990), Royal Navy officer James Mansergh (1834–1905), English civil engineer Martin Mansergh (1946–2025), Irish politician and historian Maurice Mansergh (1896–1966), Royal Navy officer Nicholas Mansergh (1910–1991), historian of Ireland and the British Commonwealth Richard St George Mansergh-St George (c.1752–1798), British Army officer and Irish magistrate Robert Mansergh (1900–1970), British Army officer