The nadir is a low or downward point of reference.

Nadir may also refer to:

  • Nadir (name), a surname and given name
  • Nadir (topography), a point of lowest local elevation
  • Nadir (astronomy), the point directly underneath a celestial observer
  • Nadir (web portal), a German web portal
  • Nadir, U.S. Virgin Islands, a settlement
  • Nadir (horse) (1955–1978), an American Thoroughbred racehorse
  • Nadirs (autobiography), by Herta Müller
  • "The Nadir", an episode of the television series Fargo
  • The Nadir, a fictional tribe in the novel Legend and other works by David Gemmell
  • "Nadir", a song by Byzantine from Oblivion Beckons
  • "Nadir", a song by Sadist from Above the Light
  • Network Anomaly Detection and Intrusion Reporter, an intrusion detection system
  • Nadir crater, a undersea feature on the Guinea Plateau in the Atlantic Ocean
  • Nadir objective vector, a concept in Multi-objective optimization

See also

  • Nadir of American race relations, a term for the period from the end of Reconstruction to the 1920s
  • Nadira, a given name