Stefan Hermann Haag OBE (26 March 1925 – 25 December 1986) was an Austrian-Australian singer; opera, theatre and television director and producer; lighting and set designer; and arts administrator.

The choir found itself stranded in Australia at the outbreak of World War II in 1939, and he decided to stay.

In 1950 he returned to Europe on a Victorian government scholarship to study arts production.

He later worked as a television and theatre producer and was artistic director of several arts festivals.

In the 1968 Queen's Birthday Honours, Stefan Haag was appointed an Officer of the Order of the British Empire for his development of the performing arts.