JJ or jj may refer to:
Wayne Lim Jun Jie (simplified Chinese: 林俊杰; traditional Chinese: 林俊傑; pinyin: Lín Jùnjié; born 27 March 1981), better known by his stage name JJ Lin, is a Singaporean singer, songwriter, record producer, and actor.
Juan José Rendón Delgado (born 1964 in Caracas, Venezuela), known professionally as JJ Rendon, is a Latin American political consultant, psychologist and political activist.
John Joseph Feild (born 1978), known professionally as JJ Feild, is a British-American film, television and theatre actor.
Jyrki Juhani Järvilehto (Finnish pronunciation: [ˈjyrki ˈjærvilehto]; born 31 January 1966 in Espoo), better known as "JJ Lehto", is a Finnish racing driver.
JJCC (pronounced J-J-C-C; Hangul: 제이제이씨씨) is a six-member South Korean hip hop boy band formed under the management of Jackie Chan Group Korea.
JJK Jyväskylä (JJK) is a Finnish football club, based in Jyväskylä. It currently plays in the Finnish second highest league Ykkönen.
James Edward "JJ" Hickson, Jr. (born September 4, 1988) is an American professional basketball player.
JJ Project (Korean: 제이제이 프로젝트) is a South Korean pop duo, consisting of JB and Jinyoung. They were formed by JYP Entertainment and released their first single "Bounce" in May 2012. They debuted as a part of Got7 in January 2014.