Alexander Johnston may refer to:Alexander Johnston (businessman) (1774–1864), Scottish mill owner Alexander Johnston (1775–1849), British colonial official and orientalist in Ceylon Alexander Johnston (1790–1844) Alexander Keith Johnston (1804–1871), Scottish geographer Alexander Robert Johnston (1812–1888), British colonial official Alexander Johnston (artist) (1816–1891), Scottish painter Alexander Keith Johnston (1844–1879), Scottish geographer Alexander Johnston (footballer) (1881–1917), Scottish footballer Alexander Johnston (historian), American historian Alexander Johnston (1867–1951), Canadian journalist, civil servant and politician Alexander Johnston, Canadian politician, Ontario MPP Alexander Johnston (1884–1952), Hampshire cricketer and army officer Alexander Johnston (1905–1994), Scottish civil servant Alexander W. Johnston, Member of the Legislative Council of Samoa Alex Johnston (1881–1965), Australian rules footballer Alex Johnston, Australian professional rugby league footballer