GJ

GJ or Gj may refer to:

Science and technology

 * Gigajoule (GJ), a unit of energy
 * Gastrojejunal feeding tube, in medicine
 * Gliese–Jahreiß Catalogue, in star designators

Transport codes

 * Gujarat, the Indian state in vehicle registrations
 * Eurofly, an Italian airline (by defunct IATA code)
 * Mexicargo, a Mexican airline (defunct IATA code)
 * Loong Air, a Chinese airline (IATA code)

Other uses

 * Gj (letter), a Latin digraph
 * Gebirgsjäger, alpine light infantry of Austria and Germany
 * Gharjamai, a live-in son-in-Law
 * Gilets jaunes (yellow vests) movement, grassroots political movement in France
 * "GJ!", a song by Babymetal on the 2016 album Metal Resistance
 * Good Judgment. Business Acronym.