Alahakoon is a surname. Notable people with the surname include:
- Jayatissa Alahakoon (1932–2019), Sri Lankan music director and composer
- Prasanna Alahakoon, Sri Lankan Navy officer and engineer
- Sujatha Alahakoon (born 1959), Sri Lankan politician
- (Don)Chandimal Alahakoon, Sri Lankan Doctor and Entrepreneur
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