Runhild Gammelsæter is a Norwegian musician notable for being the vocalist for the American bands Thorr's Hammer and Khlyst.

[1] Runhild Gammelsæter was a 17-year-old foreign exchange student from Norway when she joined Thorr's Hammer along with Stephen O'Malley and Greg Anderson.

After six weeks, which was the time it took to release Sannhet i Blodet and record Dommedagsnatt, the band split up due to Runhild returning to Oslo, Norway.

[4] On December 13, 2014, she released a collaboration album with a renowned Norwegian noise musician Lasse Marhaug, Quantum Entanglement.

Runhild Gammelsæter has a PhD in cell physiology from the Faculty of Medicine of the University of Oslo.