The annual Operaball is a masquerade with live performances held in Oslo, Norway, by the Tårnseilerne association (Swift) since 1988.

The old Freemasons Lodge in Oslo was renovated in 1989, but housed similar events in Christiania throughout the 19th century attended by some of Norway's most famous composers and artists – such as Edvard Grieg, Halfdan Kjerulf, Johan Svendsen, etc.

His first full-scale ball required roccoco costumes with Mozart style wigs, powder, and white stockings.

After a gala performance a procession walks a historical route through the city streets Count to Wedel's Square and the freemasons Lodge.

In 1998, there was an Operaball on Valentine's Day, with the Orchestra playing A midsummer Night's dream by Mendelssohn, and in 1993 there was also a Christiania Soirée, where the organizers held the first public ball at Akershus fortress since the Middle Ages.

The first mask ball in Copenhagen modeled after the Operaball in Oslo was held on 18 February 2005 in the Royal Theatre and Molktes Palé.