Gjallarhorn (Swedish pronunciation: ) is a band that performs world music with roots in the folk music of Finland and Sweden. The group was formed in 1994. The band's music echoes the ancient folk music tradition of Scandinavia with medieval ballads, minuets, prayers in runo-metric chanting and ancient Icelandic rímur epics in a modern way.

The group is named after the Gjallarhorn of Norse mythology.