LJ

LJ might be an acronym, abbreviation, or nickname for:

*LJ is the IATA code for Sierra National Airlines
*LJ, the sequent calculus of Gentzen's for intuitionist logic
*LiveJournal
*Linux Journal
*La Jolla, California
*Library Journal
*Ljubljana or its University of Ljubljana
*LaserJet
*Lord Justice of Appeal (plural: LJJ)
*Larry Johnson (basketball)
*Lawrence Jackson, USC defensive lineman.
*Larry Johnson (football)
*LJ Reyes
*Lennard-Jones potential, a function used in chemical physics
*Lemon Jelly, a British electronica duo
*Lashkar i Jhangvi, Muslim terrorist organization
*LJ Robinson, Famous In Las Vegas. myspace.com/washedinc

Fictional characters

*L. J. Burrows

See also the letter unicode|Lj, used in some Slavic languages.

It may also refer to Lje, a letter used in Serbian.