Ha may refer to:
Agencies and organizations Health authority, a former type of administrative organisation of the NHS in England and Wales Hells Angels Motorcycle Club Highways Agency (renamed Highways England, now National Highways), UK government body maintaining England's major roads Homelessness Australia, peak body organisation for homeless people and services Homosexuals Anonymous an ex-gay program for dealing with unwanted same-sex attractions Hong Kong Housing Authority Hospital Authority of Hong Kong
Arts, entertainment, and media Ha (Doseone album), 2005 Ha (Talvin Singh album), 2002 Ha! (Killing Joke album), 1982 "Ha" (21 Savage song) "Ha" (Juvenile song) Ha! (TV channel), an American all-comedy TV channel Hamar Arbeiderblad, a Norwegian newspaper Human Action, a book by the Austrian economist Ludwig von Mises The Jim Henson Company, formerly known as ha!
Language A laugh Ha (Javanese) (ꦲ), a letter in the Javanese script Ha (kana), in syllabic Japanese script ه (hāʾ), ح (ḥāʾ), or خ (ḫāʾ), Arabic letters హ (ha), a Telugu letter Ha language, the language of the Ha people in eastern Africa Hausa language, ISO 639-1 code HA
Places Ha, Bhutan Hå Municipality, a municipality in Rogaland county, Norway Ha Gorge, Greece HA postcode area, a group of English postal districts in north-west London Henan, a province of China (Guobiao abbreviation HA)
Science and technology Chemistry Hahnium, an element now called Dubnium Hyaluronan (Hyaluronic acid), a carbohydrate structure Hydroxylapatite, a mineral
Medicine Hyperandrogenic anovulation, also called polycystic ovary syndrome Health anxiety (HA) or hypochondriasis (hypochondria) Hemagglutinin (influenza) (HA), an antigenic glycoprotein from Influenza viruses Hemagglutination assay, a measurement of viruses or bacteria
Units of measure Hartree, an atomic unit of energy Hectare (ha), a unit of area Hectoampere, a unit of electric current
Other uses in science and technology ha (function prefix) (half), a prefix for some trigonometric functions in mathematics Hallstatt culture, an archaeological culture High availability, systems design and implementation with a view to maximising service Hour angle, in astronomy, one of the coordinates of the equatorial coordinate system Ha, or alternative hypothesis, in statistical testing H-alpha (Hα), a deep-red visible spectral line of the hydrogen atom
Surnames Ha (Chinese surname) (哈), found in the Hundred Family Surnames Ha (Korean surname) (, 河 or 夏) Hà, Vietnamese surname Xia (surname) (夏), romanized as Ha in Cantonese, Korean and Vietnamese pronunciation
Transportation British Rail Class 71, a locomotive (classified type HA under the Southern Region's pre-TOPS scheme) Hawaiian Airlines, former IATA designator HA Highways Agency (now National Highways), UK government body maintaining England's major roads Hungary (aircraft registration prefix HA)
Other uses Ha (mythology) Ha, one of deities Heng and Ha Ha people, a Tanzanian people Hospitalman Apprentice, a U.S. Navy rank
See also Haa (disambiguation) Haha (disambiguation) Has (disambiguation)