Norwegian National Academy of Opera ended in 1996.
National Opera of Ukraine was created in 1867.
Welsh National Opera was created in 1943.
Washington National Opera was created in 1957.
Romanian National Opera was created in 1954.
Iaşi Romanian National Opera was created in 1956.
Moldova National Opera Ballet was created in 1980.
British National Opera Company was created in 1921.
Metropolitan Opera National Council Auditions was created in 1954.
Cluj-Napoca Romanian National Opera was created in 1906.
The Flying Opera was created in 2008.
Pacific Opera was created in 2003.