Hettiarachchi is a surname. Notable people with the surname include:
- Dinuka Hettiarachchi (born 1976), Sri Lankan cricketer
- Gamini Hettiarachchi (1950–2019), Sri Lankan actor
- Indradasa Hettiarachchi, Sri Lankan politician
- Sunil Hettiarachchi (born 1937), Sri Lankan comedian and actor
- U. Hettiarachchi, Sri Lankan cricketer