Thomas Jefferson, third President of the United States

Tajikistan, central Asian nation

Tribunal de Justiça, or Court of Justice, appellate courts of Brazil.

Thomas Jefferson High School for Science and Technology

Tijuana, Mexican city (informal)

Jeep Wrangler, 1997-2006 Version of the Wrangler Mini SUV from Jeep

Temasek Junior College in eastern Singapore

T.J. Ford, NBA basketball player

Tablighi Jamaat, a popular Muslim missionary and revival effort

TJ Wagner, the comic book character known as Nocturne

Toonami Jetstream

Technical journal, now the Journal of Creation, published by Creation Ministries International

Triple jump, in athletics

T. J. Hooker, an American television show

T.J. Houshmandzadeh

Trader Joe's, a chain of specialty grocery stores

Terajoule (10¹²  joules)

TJ Goree, Captain in Confederate States Army and aide to Lt. General James Longstreet

Tj (digraph)

T.J.'s, a nightclub in Newport, Wales