LJ may refer to:
Ljubljana (UK: , US: , Slovene: [ljuˈbljàːna] (listen), locally also [luˈblàːna]; also known by other historical names) is the capital and largest city of Slovenia.
Ljubljana Jože Pučnik Airport (Slovene: Letališče Jožeta Pučnika Ljubljana) (IATA: LJU, ICAO: LJLJ), also known by its previous name Brnik Airport (Slovene: Letališče Brnik), is the international airport of Ljubljana, the capital of Slovenia.
Ljubljana Castle (Slovene: Ljubljanski grad, German: Laibacher Schloss) is a castle complex standing on Castle Hill above downtown Ljubljana, the capital of Slovenia.
Ljubodrag "Duci" Simonović (Serbian Cyrillic: Љубодраг Дуци Симоновић, pronounced [ʎǔbodrag dǔtsi simǒːnoʋitɕ]); born 1 January 1949) is a Serbian philosopher, author and retired basketball player.
Lyuba Welitsch (Veličkova; Bulgarian: Люба Величкова 10 July 1913 – 31 August 1996) was an operatic soprano.
Ljubomir "Ljupko" Petrović (Serbian Cyrillic: Љубомир Љупко Петровић; born 15 May 1947) is a Bosnian former professional football player and manager, currently of CSKA Sofia.