Alexander Leslie, 1st Earl of Leven (1582–1661) was a Scottish soldier in Dutch, Swedish and Scottish service.
Alexander Leslie may also refer to:
- Alexander Leslie, Earl of Ross (died 1402), Scottish nobleman
- Alexander Leslie (British Army officer) (1731–1794), officer active during the American Revolutionary War
- Alexander Leslie-Melville, Lord Balgonie (1831–1857), British soldier
- Alexander Leslie, Lord Balgonie (died c. 1642); see Earl of Leven
- Alexander Leslie, 2nd Earl of Leven (c. 1637–1664), Earl of Leven
- Alexander Leslie, 5th Earl of Leven (1695–1754)
- Alexander Leslie (engineer) (1844–1893), Scottish civil engineer
- Alexander Leslie of Auchintoul (1590–1663), Russian general of Scottish origin