NJ is the U.S. postal code for the state of New Jersey.

Nj or NJ may also stand for:

Places

  • Narva-Jõesuu, Estonia
  • Nanjing, Jiangsu, China

Science and technology

  • Nanojoule (nJ), an International System of Units (SI) unit of energy equal to 10<sup>−9</sup> joules
  • Neighbor joining, a bioinformatic method for the construction of phylogenetic trees

Other uses

  • Nj (digraph), a Latin-script digraph
  • Nippon Jamboree
  • Nordjyske Jernbaner, a Danish railway
  • Napierville Junction Railway
  • NJ.com, a news website

See also

  • Nje, a letter of the Cyrillic script