3 2 1, or 3, 2, 1 or 3-2-1 may refer to:

• 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

• 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

• 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

• "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

• 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

Topics referred to by the same term

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