Lonsdale is a surname. Notable people with the surname include:
Angela Lonsdale (born 1970), English actressAnne Lonsdale (born 1941), British sinologist, third President of New Hall, University of CambridgeBruce Lonsdale (1949–1982), Canadian politicianCharles Lonsdale (born 1965), British diplomatChris Lonsdale (born 1987), Bermudian former cricketer and footballerChristopher Lonsdale (1886–1952), Canadian founder and first headmaster of Shawnigan Lake School, British ColumbiaDavid Lonsdale (born 1963), English actorDerrick Lonsdale (born 1924), American pediatrician and researcherEdmund Lonsdale (1843–1913), Australian politicianFrederick Lonsdale (1881–1954), English dramatistGordon Lonsdale, alias of Konon Molody (1922–1970), Soviet spyHarry Lonsdale (1932–2014), American scientist, businessman, and politicianHoratio Walter Lonsdale (1844–1919), English painter and designerJames Lonsdale (painter) (1777–1839), English portraitistJames Rolston Lonsdale (1865–1921), Northern Irish politicianJoe Lonsdale (born 1982), American entrepreneur, investor and philanthropistJohn Lonsdale (1788–1867), Principal of King's College, London, later Bishop of LichfieldJohn Lonsdale, 1st Baron Armaghdale (1850–1924), Northern Irish businessman and politicianDame Kathleen Lonsdale (1903–1971), Irish-born British crystallographerKeiynan Lonsdale (born 1991), Australian actorMichael Lonsdale (born 1931), French actorRichard Lonsdale (1913–1988), British Army officer in the Parachute Regiment in World War IIRoger Lonsdale, British author and academicRupert Lonsdale (1905–1999), British submarine commander, prisoner of war and Anglican clergymanShawn Lonsdale (1969–2008), American videographer and critic of the Church of ScientologyTommy Lonsdale (1882–1973), English footballerWilliam Lonsdale (1794–1871), English geologist and palaeontologistWilliam Lonsdale (colonist) (1799–1864), supervised the founding of Port Phillip, later named Melbourne, AustraliaWillie Lonsdale (born 1986), New Zealand cricketer