"Longing" is a song by Japanese heavy metal band X Japan, written by Yoshiki. The song is a ballad that has been released in several versions, most notably in two different single variations. The first, "Longing ~Togireta Melody~" (Longing ～跡切れたmelody～^?), was released as their eleventh single on August 1, 1995 and reached the number 1 spot on the Oricon chart. The second, "Longing ~Setsubou no Yoru~" (Longing ～切望の夜～^?), is their twelfth released on December 11, 1995 and reached number 5.

The song was first released as a demo tape titled "Longing ~Togireta Melody~", which was given out at X Japan's December 30-31, 1994 Tokyo Dome concerts. The demo also included a recording of the band practicing "Longing", "Break the Darkness", "Scars" and "Dahlia". In 2007, this demo tape was re-released on CD in the Aoi Yoru Shiroi Yoru Complete Edition, a DVD set of the two concerts where it was first released.

The first single of the song, released on August 1, 1995, is very similar to the demo and as such shares the same name. Although it is nearly a minute longer and includes drums, which the demo lacked. This is the version of the song that was included on the album, Dahlia. Released on December 11, 1995, the second single "Longing ~Setsubou no Yoru~", only includes Toshi's vocals and a symphony, and is much more melancholic than the other. This single's third track is an English version of the song, where, instead of Toshi singing, Yoshiki reads the lyrics as one would a poem.

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