JU may refer to:
Justin Drew Bieber (; born March 1, 1994) is a Canadian singer, actor and songwriter. After a talent manager discovered him through his YouTube videos covering songs in 2008 and he signed to RBMG, Bieber released his debut EP, My World, in late 2009. It was certified platinum in the U.S.
Gaius Julius Caesar (; 12 or 13 July 100 BC – 15 March 44 BC), known by his cognomen Julius Caesar, was a Roman politician and military general who played a critical role in the events that led to the demise of the Roman Republic and the rise of the Roman Empire.
Juventus Football Club S.p.A. (from Latin: iuventūs, "youth"; Italian pronunciation: [juˈvɛntus]), colloquially known as Juve (pronounced [ˈjuːve]), is a professional Italian football club in Turin, Piedmont.