"Mad World" is a 1982 song by British band Tears for Fears. Written by Roland Orzabal and sung by bassist Curt Smith, it was the band's third single release and first chart hit, reaching number three on the UK Singles Chart in November 1982. Both "Mad World" and its B-side, "Ideas as Opiates", appeared on the band's debut LP The Hurting (1983). This single was also the band's first international success, reaching the Top 40 in several countries in 1982–83.

"Mad World" has since been covered by various artists, including a 2001 version recorded by Michael Andrews and Gary Jules for the soundtrack of the film Donnie Darko; a 2003 single release of the song reached number one in the UK for three consecutive weeks and won Orzabal his second Ivor Novello Award. A 2021 rendition of the song was included on Demi Lovato's album Dancing with the Devil... the Art of Starting Over.

The cover photo was taken at Round Pond in Kensington Gardens (London, England).