HHA may refer to:
- HHA Services, an American service company
- Historic Houses Association, a not-for-profit organisation, represents 1,600 privately owned historic country houses, castles and gardens throughout the UK
- Haji Husein Alireza & Co. Ltd., a Saudi Arabian trading company
- Hallische Händel-Ausgabe, a collection of the works of George Frideric Handel
- Hamburger Hochbahn, a transit operator in Hamburg, Germany
disambiguation page lists articles associated with the title HHA.
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