Chaostar is a classical, opera and vocal orchestra from Greece started in 1998, composed of Christos Antoniou, Spiros Antoniou, Sotiris Vayenas, Nathalie Rassoulis, and Sapfo Stavridou. Several of the members are also members of Septicflesh. They have released four albums on Holy Records, a label with notable artists such as Elend, Orphaned Land, and Septicflesh.

• Chaostar (2000)
• Threnody (2001)
• The Scarlet Queen (2004)
• Underworld (Compilation) (2007)
• Anomima (2013)
• The Undivided Light (2018)

Current members

• Christos Antoniou – guitars, piano, synthesizer, orchestral arrangements (1998–present)
• Androniki Skoula – mezzo-soprano (2009–present)
• George Diamantopoulos – traditional instruments (2012–present)
• Charalampos Paritsis – electric violin (2012–present)
• Nick Vell – percussions (2013–present)

Past members

• Spiros Antoniou – bass, grunts (1998–2004)
• Sotiris Vayenas – guitars, clean vocals (1998–2004)
• Nathalie Rassoulis – soprano (1998–2004)
• Sapfo Stavridou – vocals (2006–2007)
• Dionisis Christodoulatos – keyboards (2013)
• Fotis Benardo – drums (2012–2014)

• Chaostar's Myspace
• Christos Antoniou's website (archived)