JJJ is an acronym for Australian radio station Triple J.
JJJ may also refer to:
- JJJ, the production code for the 1971 Doctor Who serial The Dæmons
- J. Jonah Jameson, a fictional character created by Stan Lee and Steve Ditko
- J. Jonah Jameson (film character), the Sam Raimi Spider-Man trilogy and Marvel Cinematic Universe versions
- Jaren Jackson Jr., an American basketball player
- Jingjinji, a metropolitan region of China