HAA

HAA may refer to:

Haa as a word

 * Hå, a municipality in Norway
 * Haa District, Bhutan
 * Haa, Bhutan, the seat of the district
 * Hāʼ, Arabic letter ه
 * Hän language

HAA as a code or acronym

 * Haloacetic acid
 * Hasvik Airport in Finnmark, Norway
 * Healthy Americans Act, a United States Senate bill
 * Heavy anti-aircraft
 * High Achievement Academy, in Beachwood, Ohio, United States
 * High-altitude airship
 * Honolulu Academy of Arts
 * Hopper wagons of the British Rail Merry-go-round train
 * NRC Herzberg Astronomy and Astrophysics Research Centre