JJ or jj may refer to:
JJ Lin (traditional Chinese: 林俊傑; simplified Chinese: 林俊杰; pinyin: Lín Jùn Jié) is a Singaporean singer, songwriter, record producer and actor based in Taiwan.
Juan José Rendón Delgado (born 1964 in Caracas, Venezuela), known professionally as JJ Rendon, is a non-progressive Latin American political consultant, psychologist and political activist.
JJCC (pronounced J-J-C-C, Hangul: 제이제이씨씨) is a six-member South Korean hip-hop boy group formed under the management of Jackie Chan Group Korea.
Jyrki Juhani Järvilehto (Finnish pronunciation: [ˈjyrki ˈjærvilehto]; born 31 January 1966 in Espoo), better known as "JJ Lehto", is a Finnish racing driver.
James Edward "JJ" Hickson, Jr. (born September 4, 1988) is an American professional basketball player for the Fujian Sturgeons of the Chinese Basketball Association (CBA).
John Joseph Feild (born 1978), known professionally as JJ Feild, is a British-American actor.
JJK Jyväskylä (JJK) is a Finnish football club, based in Jyväskylä. It currently plays in the Finnish second highest league Ykkönen.
JJB Sports plc (stylized as JJb sports) was a British sports retailer. On 24 September 2012, shares in JJB Sports were suspended, and the firm called in administrators.
JJ, styled as jj, is a band who releases music through the Gothenburg-based independent label Sincerely Yours, which was founded by the Swedish pop group The Tough Alliance.