Alexander Johnston
Alexander Johnston may refer to:
- Alexander Johnston (businessman), Scottish mill owner
- Alexander Johnston (1775–1849), British colonial official and orientalist in Ceylon
- Alexander Johnston (Scottish politician)
- Alexander Keith Johnston (1804–1871), Scottish geographer
- Alexander Robert Johnston, British colonial official
- Alexander Johnston (artist), Scottish painter
- Alexander Keith Johnston (1844–1879), Scottish geographer
- Alexander Johnston (footballer), Scottish footballer
- Alexander Johnston (historian), American historian
- Alexander Johnston (Canadian politician), Canadian journalist, civil servant and politician
- Alexander Johnston (Ontario politician), Canadian politician, Ontario MPP
- Alexander Johnston (British Army officer), Hampshire cricketer and army officer
- Alexander Johnston (civil servant), Scottish civil servant
- Alexander W. Johnston, Member of the Legislative Council of Samoa
- Alex Johnston (Australian rules footballer), Australian rules footballer
- Alex Johnston (rugby league), Australian professional rugby league footballer