Hao or HAO may refer to:
People
- Hao (surname) (Chinese: )
- Hao (given name)
- Hao (video gamer), Chinese professional Dota 2 player
- Heather O'Reilly, Professional soccer player
Places
- Hao (city), or Haojing (), capital of the Western Zhou, near present-day Xi'an
- Xi'an, China, derived from the ancient city
- Hao (French Polynesia), an atoll
- Hao Airport
- Hao Prefecture (), of imperial China
- Hao River, in Thailand
- Butler County Regional Airport IATA code
Other uses
- Art name (Chinese: , hào)
- Hakö language, spoken in Papua New Guinea
- hào, a disused monetary subunit of the Vietnamese đồng
- , a fictional character and the main antagonist in the manga and anime Shaman King
- High Altitude Observatory
- High Armanen Order
- Rauvolfia sandwicensis (Hawaiian: '), a flowering plant
- Hydroxylamine oxidoreductase, an enzyme involved in the nitrogen cycle
See also
- Hau (disambiguation)
- How (disambiguation)
- Howe (disambiguation)