John McLachlan may refer to:John McLachlan (architect) (1843–1893), Scottish architect John McLachlan (bishop) (1826–1893), Scottish Roman Catholic clergyman John McLachlan (composer), Irish composer John McLachlan (politician) (1840–1915), New Zealand Member of Parliament John MacKean McLachlan (1873-1930), British socialist politician Dr John MacLachlan (1804-1874), Scottish Gaelic poet