| Gjallarhorn | |
| Type: | ep |
| Artist: | 9mm Parabellum Bullet |
| Cover: | 9mmParabellumBullet_Gy.jpg |
| Released: | December 8, 2005 |
| Genre: | Rock, Hardcore, Punk |
| Length: | 20:15 |
| Label: | under_bar ZNR-008 |
| Producer: | 9mm Parabellum Bullet |
| Prev Title: | Talking Machine |
| Prev Year: | 2004 |
| Next Title: | Phantomime |
| Next Year: | 2006 |
is the first mini-album of Japanese rock band 9mm Parabellum Bullet released on December 8, 2005. The song "Marvelous", as well as "Talking Machine" and "(Teenage) Disaster", were later re-recorded in The World e.p..