Lorentz Aspen (born 23 April 1978 in Stavanger) is a Norwegian heavy metal pianist and keyboardist. He played in Theatre of Tragedy from 2 October 1993 to 2 October 2010 and with them he released seven studio albums, one live album and five EP's. He also played in Imperium as an additional musician, and he played the hammond organ on Therion's Vovin.