Avantasia is a German supergroup metal opera project created by Tobias Sammet, vocalist of the band Edguy. It has been characterized as a rock opera, as it features the contributions of various vocalists and musicians and it consists of concept albums. The name is a blend of the words Avalon and fantasia ('fantasy') and describes "a world beyond human imagination".

Tobias Sammet is a German musician, songwriter, and music producer. He is the singer and primary songwriter of the power metal band Edguy, and the founder of the metal opera project Avantasia.