IHOS Music Theatre and Opera is a Tasmanian opera company was established in Hobart in 1990, by composer and artistic director Constantine Koukias, and production director Werner Ihlenfeld to create original music-theatre and opera works.

This article relies excessively on references to primary sources. (November 2010)

• Olegas - by Constantine Koukias, Libretto by Natasha Cica
• Tesla - Lightning in His Hand. - An opera in two parts, sung in English By Constantine Koukias.
• The Divine Kiss (Das Böse ist Immer und Überall) - An opera sung in Modern and Ecclesiastical Greek, Hebrew, German and English by Constantine Koukias. Dedicated to the memory of Józef Wawrzynczak
• To Traverse Water - An Opera in Two Parts Sung in Ecclesiastical & Modern Greek by Constantine Koukias
• Days and Nights with Christ - An opera by Constantine Koukias
• Prayer Bells - A concert piece by Constantine Koukias
• The Lunch Box - A chamber opera by Thanapoom Sirichang, sung in Thai

In late 1999 IHOS formed the IHOS Music Theatre Laboratory, a sub-section of the main company that provides training for young opera / music-theatre performers, as well as commissioning and collaborative opportunities for Australian composers, directors and designers.

• IHOS Music Theatre and Opera
• The Tasmanian Composers Collective