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 <!-- intentionally duplicated -->
  • 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

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

  • Ha (Javanese) (ꦲ), a letter in the Javanese script
  • Ha (kana), in syllabic Japanese script
  • <big>ه</big> (hāʾ), <big>ح</big> (ḥāʾ), or <big>خ</big> (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
  • H<sub>a</sub>, 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<!-- *Ha (河), Korean surname
  • Ha (賀), Chinese and Korean surname --><!-- these are not useful until they have articles to link to -->

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 <!-- intentionally duplicated -->
  • 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)