HOA may refer to:
- Hoa, a minority group in Vietname of Chinese ethnicity, numbering some 2.3 million presently
- Habitual offender laws
- A homeowners' association, a legal entity created by a real estate developer for the purpose of developing, managing and selling a community of homes or a voluntary association of homeowners gathered together to protect their property values and to improve the neighborhood
- The Horn of Africa, a peninsula in East Africa that juts for hundreds of kilometers into the Arabian Sea
- The ǂHõã language of Botswana
- Heads of Agreement (law), a non-binding document used in contract law
- The Hands of Asclepius, a fictional organization in the game Trauma Center: Under the Knife 2
- House of Anubis, a Nickelodeon drama series
- Hypertrophic osteopathy, a bone disease