Nu or NU may refer to:

  • Nu (letter), a letter in the Greek alphabet: lowercase ν, uppercase Ν
  • Nu (kana), the Japanese characters ぬ and ヌ
  • Nu (mythology), the male form of the Egyptian goddess Naunet
  • Nu (Chrono Trigger), a fictional species from the video game Chrono Trigger
  • N.U. (film), 1948 documentary film directed by Michelangelo Antonioni
  • .nu, the Internet top-level domain for Niue
  • Nu people, a Chinese ethnic group
  • Nu river or Salween River
  • U Nu or Mr. Nu, a former Burmese prime minister
  • Mr. Nu, a fictional character from the novel Hitman: Enemy Within
  • Nǀu language, a moribund Tuu (Khoisan) language spoken by the Nǁnǂe people in South Africa
  • NuMachine computer architecture developed at MIT in the late 1970s that included the NuBus.
  • Nu (programming language), an interpreted object-oriented programming language
  • Nu Gundam, in the anime Mobile Suit Gundam: Char's Counterattack
  • Nu, a Yiddish interjection meaning "well?" or "so?"
  • a Chinese term for crossbow, as in the chu-ko-nu or repeating crossbow

In universities:

  • Niagara University, a Roman Catholic university in Niagara County, New York
  • Northeastern University, an American research university in Boston, Massachusetts
  • Northwest University, a private university in Kirkland, Washington
  • Northwestern University, an American research institution in Evanston, Illinois
  • Norwich University, a private American military and traditional university in Northfield, Vermont
  • University of Nebraska–Lincoln
  • Argentinean National Universities
  • Nanjing University, a national university in China
  • Naresuan University, a public university in Phitsanulok, Thailand
  • Nile University, a private research university in Egypt
  • National University (Philippines), a private, non-sectarian university in Manila, Philippines
    • NU Bulldogs, the intercollegiate athletic program of the above school
  • Nkumba University, a private university near Entebbe, Uganda
  • Nirma University, a private university in Ahmedabad, India

In other abbreviations:

  • Northern Union (NU), early name of the Rugby Football League
  • Nunavut (NU), the largest and newest territory in the territories of Canada
  • Nahdatul Ulama (NU), an Islamic group in Indonesia
  • Nusselt number (Nu), a dimensionless heat transfer ratio
  • Poisson's ratio, a dimensionless ratio relating strain on element along one axis to the strain in an orthogonal axis, is symbolized by the Greek Nu
  • Nucellar embryony (Nu+), a form of seed reproduction that occurs in certain plant species
  • Bhutanese ngultrum (Nu.), Bhutan's official currency
  • Northeast Utilities, a gas and electric company in the northeastern United States

In codes:

  • Japan Transocean Air IATA airline designator
  • Nicaragua NATO country code
  • Niue ISO 3166 country code

In music:

  • Nu Metal, a fusion genre of Heavy Metal.
  • Nu Jazz, a fusion genre of Jazz.
  • Nu-Disco, a Dance music genre.
  • Nu folk, a fusion genre of Folk.
  • Nu Gaze, a fusion genre of Shoe Gaze.
  • Nu prog, a subgenre of Progressive Rock.