GJ or Gj may refer to:
Gjirokastër (Albanian pronunciation: [ɟiɾokastəɾ], definite Albanian form: Gjirokastra), is a city in southern Albania, situated in a valley between the Gjerë mountains and the Drino, at 300 metres above sea level.
Gjakova (Albanian: Gjakovë) or Đakovica (Serbian Cyrillic: Ђаковица) is a city and municipality in western Kosovo.
Gjilan (on Albanian, Gjilani) or Gnjilane (on Serbian, Гњилане) is a city and municipality in eastern Kosovo.
Gjorge Ivanov, also transliterated as Ǵorge (Macedonian: Ѓорге Иванов, pronounced [ˈɟɔrɡɛ ˈivanɔf]; born May 2, 1960), is the President of the Republic of Macedonia, in office since 2009.
Gjergji Muzaka (born 26 September 1984 in Tiranë) is an Albanian professional footballer who plays for Skënderbeu Korçë in the Albanian Superliga as a midfielder.
Gjon Kastrioti or John Castriot (13?? – 4 May 1437) was an Albanian nobleman, member of the Kastrioti family, and the father of Skanderbeg.
Gap junction beta-1 protein (GJB1), also known as connexin 32 (Cx32) is a transmembrane protein that in humans is encoded by the GJB1 gene.