Slessor is a surname. Notable people with the surname include:
Catherine Slessor Scottish architecture writer Elliot Slessor (born 1994), English snooker player Frederick Slessor (1831–1905), British railway engineer John Slessor (1897–1975), Marshal of the Royal Air Force Kenneth Slessor (1901–1971), Australian poet Mary Slessor (1848–1915), Scottish missionary Tim Slessor (1931–2026), British filmmaker
See also Slesser