NI or Ni may refer to:
Arts and entertainment
- Ni, or Nishada, the seventh note of the Indian musical scale in raga
- New Internationalist, a magazine
- Knights Who Say "Ni!", characters from the film Monty Python and the Holy Grail
Businesses
- National Instruments, a U.S. producer of automated test equipment and virtual instrumentation software
- National Insurance, a system of taxes and related social security benefits in the United Kingdom
- Native Instruments, a music software production company
- News International, a British newspaper publisher
- Portugália airline (IATA code NI)
Language
- Ni (letter), or Nu, a letter in the Greek alphabet: uppercase Ν, lowercase ν
- Ni (kana), romanisation of the Japanese kana に and ニ
- Ni (cuneiform), a sign in cuneiform writing
Names
- Ni (surname) (倪), a Chinese surname
- Ní, a surname prefix from the shortened form of the Irish word for a daughter
- Ni, female prefix to some Balinese names
Places
- Ni River (New Caledonia), a river of New Caledonia
- Ni River (Virginia), a tributary of the Mattaponi River
- Mount Ni, a hill in Shandong, China
- Nicaragua (ISO country code NI)
- .ni, Nicaragua's internet domain
- Norfolk Island, an external territory of Australia
- North Island, one of the two main islands of New Zealand
- Northern Ireland, a constituent country of the United Kingdom
- Lower Saxony (German: Niedersachsen), a state of Germany (ISO 3166-2 code DE)
Science and technology
- Nickel, chemical element with symbol Ni
- Ampere-turns, sometimes abbreviated NI
- Natural insemination i.e. sexual intercourse, in contrast to artificial insemination
- Nitrogen Triiodide, a sensitive contact explosive
- Natural intelligence, a term used to contrast intelligence found in nature, particularly in man, from artificial intelligence
Other uses
- NI Tank, a Russian military vehicle
- Nishan-e-Imtiaz, a Pakistani civilian decoration
- Non-Inscrits (NI), members of the European Parliament not enrolled in any political group of the European Parliament
See also
- Nee (disambiguation)