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 backup rule, a popular rule for computer data storage backup 321 Florentina, a main-belt asteroid BMW 321, a mid-sized luxury car British Rail Class 321
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 3.2.1, a Thai Pop group under the Kamikaze label.
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 "3,2,1", a song by Tucker Wetmore "3, 2, 1" (24kGoldn song), 2021 "321", a 2008 single by Disciple from Southern Hospitality "321", a song by Hedley from the 2005 album Hedley "321", a song by Scorpions from the 2007 album Humanity: Hour I
See also 321st (disambiguation) 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