Gregan is a surname. Notable people with the surname include:
- Brian Gregan (born 1989), Irish sprinter
- Eugene Gregan (born 1937), American painter
- George Gregan (born 1973), Australian rugby union player
- John Edgar Gregan (1813–1855), Scottish architect
- Miroslav Gregáň (1996), Slovak footballer
- Sean Gregan (born 1974), English footballer
See also
- Gregan McMahon (1874–1941), Australian actor and theatrical producer
- Grogan
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