PRIME Sth is an alternative metal quartet from Stockholm, Sweden. The band, which includes vocalist Noa Modén, guitarist Martin Påhlsson, bassist Jesper "JSPR" Eksjoo, and drummer Kasper "Kaz" Lindgren, was formed while the members were teenagers.

As of 2006, the band has released two full-length recordings, Underneath the Surface and Beautiful Awakening, with help from veteran music producer Andy Wallace, as well as studio engineer Tom Lord-Alge.

PRIME Sth has toured with several notable acts, including (but not limited to):

-Blink-182
-Faith No More
-Live
-Rage Against the Machine