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