"Under the Sign of the Black Mark" is the third studio album by the Swedish heavy metal band Bathory, released in 1987. The album is notable for its blend of black metal and Viking metal elements, showcasing the band's signature sound characterized by aggressive guitar riffs and atmospheric melodies. It features themes of Norse mythology and dark imagery, which are prevalent throughout the tracks. The album includes iconic songs such as "A Fine Day to Die" and "The Golden Walls of Heaven," which highlight Bathory's influence on the black metal genre. Its raw production and powerful lyrics have made it a significant work in the evolution of heavy metal music.