TJ

The initials TJ may refer to:

* Troll.J, creepy kid
* Tajikistan, central Asian nation
* "Technical journal", now the "Journal of Creation", published by Creation Ministries International
* Teenage Jesus, an American post-punk band
* Temasek Junior College in eastern Singapore
* Therapeutic jurisprudence, the study of the effect that legal rules and procedures produce on individuals involved in legal processes
* Thomas Jefferson, third President of the United States
* Thomas Jefferson High School for Science and Technology
* Toonami Jetstream
* Tj (digraph)
* TJ Goree, Captain in Confederate States Army and aide to Lt. General James Longstreet
* Terajoule (10¹² joules)
* Tijuana, Mexican city (informal)
* T. J. Ford, NBA basketball player
* T. J. Hooker, an American television show
* "Tribunal de Justiça", or Court of Justice, appellate courts of Brazil.
* Triple jump, in athletics
* T.J. Houshmandzadeh
* T.J.'s, a nightclub in Newport, Wales
* Jeep TJ, Canadian name for the 1997-2006 Jeep Wrangler, an off-road vehicle
* TJ Wagner, the comic book character known as Nocturne
* Trader Joe's, a chain of specialty grocery stores