18

Eighteen or 18 may refer to:


 * 18 (number), the natural number following 17 and preceding 19
 * one of the years 18 BC, AD 18, 1918, 2018

Film, television and entertainment

 * 18 (film), a 1993 Taiwanese experimental film based on the short story God's Dice
 * Eighteen (film), a 2005 Canadian dramatic feature film
 * 18 (British Board of Film Classification), a film rating in the United Kingdom, also used in Ireland by the Irish Film Classification Office
 * 18 (Dragon Ball), a character in the Dragon Ball franchise
 * "Eighteen", a 2006 episode of the animated television series 12 oz. Mouse

Science

 * Argon, a noble gas in the periodic table
 * 18 Melpomene, an asteroid in the asteroid belt

Albums

 * 18 (Moby album), 2002
 * 18 (Nana Kitade album), 2005
 * 18..., 2009 debut album by G.E.M.
 * 18 (Jeff Beck and Johnny Depp album), 2022

Songs

 * "18" (5 Seconds of Summer song), from their 2014 eponymous debut album
 * "18" (One Direction song), from their 2014 studio album Four
 * "18", by Anarbor from their 2013 studio album Burnout
 * "I'm Eighteen", by Alice Cooper commonly referred to as simply "Eighteen", 1970
 * "Eighteen" (CLC song), 2015
 * "Eighteen" (Pale Waves song), 2018
 * "Eighteen", by Connie Francis, 1957
 * "Eighteen", by ¡Forward, Russia!, 2006
 * "Eighteen", by Patricia Cahill, B-side to "Colm Bán", 1971