Mantras is the fourth studio album by Czech black metal band Master's Hammer, independently-released on 3 December 2009. It is the band's first album of new material since à  lágry on 1995, and sees them returning to the black metal style of their first two albums, but blending it with the experimental sound demonstrated on à  lágry. It was released both in CD and vinyl format; the vinyl version contains less tracks.
The track "Vrana" is a tribute to painter Martin Vrana, a long-time friend of Master's Hammer's vocalist Franta à  torm. Vrana illustrated the album's cover art.
"Jáma pekel" was originally featured on the band's debut album, Ritual..
Tracks 9 to 12 are absent of the vinyl release.