Gjallarhorn (disambiguation)

Gjallarhorn refers to both a musical instrument and a drinking horn in Norse mythology.

Gjallarhorn may also refer to:
 * Gjallarhorn (band), a Swedish language folk music band from Finland
 * Gjallarhorn (album), 2005 album by Japanese band 9mm Parabellum Bullet
 * Gjallarhorn, magazine published by the National Socialist Movement of Norway
 * Gjallarhorn, fictional organization in the anime series Mobile Suit Gundam: Iron-Blooded Orphans
 * "Gjallarhorn" an exotic rocket launcher from the game Destiny (video game)
 * Gjallarhorn (album), a 2017 album but Danheim for the single album
 * Gjallarhorn (song), a song by Danheim from his album Munarvágr