JU may refer to:
Justin Drew Bieber (/ˈbiːbər/; born March 1, 1994) is a Canadian singer and songwriter. After a talent manager discovered him through his YouTube videos covering songs in 2008 and signed to RBMG, Bieber released his debut EP, My World, in late 2009. It was certified Platinum in the U.S.
Justin Randall Timberlake (born January 31, 1981) is an American singer-songwriter, actor and record producer.
The Justice League, also known as the Justice League of America (JLA), is a fictional superhero team appearing in American comic books published by DC Comics.