Alexander or Alex Campbell may refer to:
Canadian politicians
- Alexander Campbell (Upper Canada politician) (1770–1834), farmer and political figure in Upper Canada
- Alexander Franklin Campbell (1845–?), Canadian politician
- Sir Alexander Campbell (Canadian senator) (1822–1892), legislator, minister, Lieutenant Governor, and Senator
- Alexander B. Campbell (born 1933), premier of Prince Edward Island (1966–78)
- Alexander Campbell (Nova Scotia politician) (1826–1909), Scottish-born notary public and political figure in Nova Scotia, Canada
- Alexander Campbell (Newfoundland politician) (1876–1940), physician, fox rancher and political figure in Newfoundland
- Max Campbell (1888–1962), Canadian politician
Politicians and military
- Alexander Cameron Campbell, MP for Argyllshire, 1841–1843
- Alexander Campbell (American politician) (1779–1857), Ohio
- Alexander Campbell (Illinois politician) (1814–1898)
- Alexander Campbell (Australian politician) (1812–1891), New South Wales politician
- Alexander Douglas Campbell (1899–1980), British Army officer
- Sandy Campbell (GC), George Cross recipient
- Alexander Glynn Campbell (1796–1836), MP for Fowey 1819–1820
- Alexander Henry Campbell (1822–?), British Conservative politician
- Alexander James Campbell (1846–1926), Australian politician
- Alexander William Campbell (general) (1828–1893), American Civil War Confederate general
- Sir Alexander Campbell, 1st Baronet (1760–1824), British general
- Captain Alexander Campbell (1756–1785), British Army officer and MP for Nairnshire
- Colonel Alexander Campbell of Possil (1754–1849), military officer
- General Alexander Campbell (died 1832), British Army officer and MP for Anstruther Burghs
Others
- Alasdair Caimbeul (writer), Scottish Gaelic author
- Alex Campbell (footballer), footballer for Clapton Orient
- Alex Campbell (ice hockey) (born 1948), Canadian former ice hockey player
- Alex Campbell (singer) (1925–1987), Scottish folk singer
- Alex Campbell (golfer)
- Alexander Buchanan Campbell (1914–2007), Scottish architect
- Alexander Campbell (suspected Molly Maguire), Irish-born tavern owner, executed in Pennsylvania as a suspected Molly Maguire
- Alexander Campbell (clergyman) (1788–1866), Religious reformer on the American Frontier during the Second Great Awakening
- Alexander Campbell (musician and writer) (1764–1824), Scottish musician and miscellaneous writer
- Alexander Campbell of Carco (died 1608), Scottish prelate, Bishop of Brechin
- Alexander Petrie Campbell (1881–1963), Australian-born religious leader