3 2 1, or 3, 2, 1 or 3-2-1 may refer to:
Outside of music and entertainment
- The year 321 or year 321 BC
- 321 (number), the number 321
- 3-2-1, a popular rule for computer data storage backup
- 321 Florentina, a main-belt asteroid
- BMW 321, a mid-sized luxury car
Entertainment
- 3-2-1, Yorkshire TV gameshow 1978–1988
- 3,2,1... Frankie Go Boom, 2012 film directed by Jordan Roberts
- 3-2-1 Contact, an American science educational television show that aired on PBS 1980–1988
- 3-2-1 Penguins!, a series of Christian computer-animated (direct-to-video until 2003) cartoons launched on November 14, 2000
Music
Albums
- 3.2.1., an album by the rock band Zilch, 1998
- Three. Two. One., an album by Lennon Stella, 2020
- 3-2-1, a compilation album by Lior (singer), 2011
Songs
- "3 2 1" (Shinee song), a 2013 song by Shinee
- "3-2-1" (Brett Kissel song), a song by Brett Kissel from the 2013 album Started with a Song
- "321", a song by Scorpions from the 2007 album Humanity: Hour I
- "321", a song by Hedley from the 2005 album Hedley
- "321", a 2008 single by Disciple from Southern Hospitality
- "3, 2, 1", a song by 24kGoldn from the 2021 album El Dorado
See also
- 4, 3, 2, 1, various topics
- 5-4-3-2-1, a 1963 single by Manfred Mann
- Countdown, a sequence of backward counting to indicate the time remaining before an event is scheduled to occur
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