Agajanian is an Armenian surname. Notable people with the surname include:
- Ben Agajanian (born 1919), Armenian-American football player
- Cary Agajanian, one of the owners of the CURB/Agajanian/Beck Motorsports Indy Racing League team
- Dennis Agajanian, Christian musician known as one of the fastest flatpickers in the world
- J. C. Agajanian (1913-1984), Armenian-American motorsports promoter and race car owner
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