LJ may refer to:
Ljubljana (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.
Ljubomir Fejsa (Serbian Cyrillic: Љубомир Фејса, Rusyn: Любомир Фейса; born 14 August 1988) is a Serbian professional footballer who plays as a defensive midfielder for Portuguese club Benfica and the Serbia national team.
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.