Alexander Duncan may refer to:
- Alexander Duncan (bishop) (1655–1733), Scottish Episcopal clergyman and bishop
- Alexander Duncan (politician) (1788–1853), U.S. Representative from Ohio
- Alexander Duncan (police officer), Scottish police officer and Chief Commissioner of Victoria Police (Australia), 1937–1954
- Alex Duncan (1900–1984), former Australian rules footballer
- Alexander Duncan (doctor), British doctor who spent six years in a village high up in the Wakhan Corridor of north-eastern Afghanistan
- Alexander William Duncan, Scottish cricketer and rugby player
Famous quotes containing the word duncan:
“A million years of sensitive men dying for their dreams. For what? So you can swim and dance and play.”
—David Duncan (b.1913)