McLachlan is a surname. It is derived from the Gaelic MacLachlainn. Notable people with the surname include:
Alexander McLachlan (1872–1956), Australian senatorAlexander McLachlan (poet) (1818–1896), Scottish-born Canadian poetAngus McLachlan (born 1944), Australian pastoralist and former first-class cricketerCraig McLachlan, Australian actor and singerGeorge McLachlan, Scottish footballerIan McLachlan, Australian landownerJames McLachlan (disambiguation)Jimmy McLachlan, Scottish footballerJohn McLachlan (disambiguation)Kyle MacLachlan, American actorLaurentia McLachlanMichael A. McLachlan (born 1958), American politicianMike McLachlan, American politicianRyan McLachlan, fictional characterSarah McLachlan, Canadian musicianTiffany McLachlan, fictional characterTom McLachlan, Australian rugby league footballerVirginia McLachlan, Canadian Paralympic sprinterWilliam McLachlan (disambiguation)