Andreas Johen Michestnen (b. 1976-) is a Norwegian keyboardist, organist and artist. He began his career in 1995 playing keyboards for several local metal bands before he was recruited into Nocturna in 1997. He remained in the band until leaving in 2007 to seek other ventures. Since 2000 he has designed album artwork for various bands.
- Templum Exuro Per Diabolus (1997)
- Sarcalogos Dico Pro Ultionis (2000)
- Attero Templum (2001)
- Inconcessus Per Vestri Filiolus (2003)
- Nex Est Meus Vita , Cruor Est Meus Via (2005)
- Ortus Cruor Astrum (2007)