"Crazy Night" (クレイジーナイト, Kureijī Naito) (also known as "Crazy Nights") is the fourth single by Japanese heavy metal band Loudness, from their 1985 album Thunder in the East.

Written by lead vocalist Minoru Niihara and guitarist Akira Takasaki and produced by Max Norman, the single was released by Nippon Columbia on December 1, 1984, in Japan and by Atco Records on November 1, 1985.

featured in the song came about when Norman asked Niihara to come up with something to sing over the main riff between the chorus and next verse.

Loudness has re-recorded the song in their self-cover albums RockShocks (2004) and Samsara Flight (2016).

[5] All lyrics are written by Minoru Niihara; all music is composed by Akira Takasaki