Ha

ha may mean:

• hectare (ha), SI (metric system) unit of surface area
• the ISO 639 alpha-2 language code for the widely-spoken African Hausa language

The all-uppercase HA may refer to:

• the Highways Agency, an executive agency, part of the Department for Transport in the United Kingdom
• the Ha! comedy channel, one of the precursors to Comedy Central
• the British Rail pre-TOPS classification for twenty-four electric locomotives, later known as British Rail Class 71
• Haiti (FIPS 10-4 country code)
• Hawaiian Airlines (IATA airline designator)
• Hearst-Argyle, a media company in the United States
• Hells Angels, a motorcycle club
• hemagglutinin or hemagglutination assay, in virology
• High availability
• Home agent, a computer router
• Home automation
• Homeowners association
• Hong Kong Housing Authority
• Hospital Authority, responsible for all public hospitals and institutes in Hong Kong
• Housing association
• HA postcode area, in Britain
• Hyaluronan, a molecule found in the body
• Hydroxylapatite, a mineral
• Head Automatica, an American powerpop band
• HA (video format)

Ha can mean:

• Ha (ethnic group), a people in Tanzania
• Hāʼ, a letter of Arabic alphabet (ﻩ)
• Kha, a letter of Cyrillic alphabet
• Ha (kana), romanisation of the Japanese kana は and ハ
• Ha, Bhutan
• Ha (mythology), a minor deity in Egyptian mythology
• the former symbol for the element dubnium (first called hahnium)
• Hå, a municipality in Norway
• "Ha" (song), a single by Juvenile

hA can mean:

• Hectoampere, an SI unit of electric current (equal to 100 A)

See also

• Haha, disambiguation