Decadence refers to a personal trait, or to the state of a society (or segment of it).

Decadence or Decadent may also refer to:

• Decadence (band), a Swedish metal band
• Decadence (TV series), a television documentary
• Decadence (album), a 2004 album by Head Automatica
• "Decadence", a song by Pet Shop Boys from the album Alternative
• Decadence, a play by Steven Berkoff
• Decadence (film), a 1994 film
• Decadence (novel), a 1925 novel by Maxim Gorky
• Decadent movement, an art movement of the late 19th century
• Decadent (band), a South Korean indie rock band
• Decadent (U.D.O. album), 2015
• Decadent, 1999 album by Threshold
• Decadent (Decadent album), 2018
• "Decadence" a song by Disturbed from the album Ten Thousand Fists
• "Decadance", a song by Living Colour from the album The Chair in the Doorway
• Deca-Dence, a 2020 anime television series