Juha Grigori Amadeus Lundberg (born 29 March 1989), better known as Amadeus, is a Finnish singer.

He became famous after winning the Tangomarkkinat tango contest in 2009.

Amadeus released his debut album on 27 January 2010.

The album, simply called Amadeus, featured his first single "Matador", his Tangomarkkinat winning entry "Onnemme kyyneleet" and of course his Euroviisut entry "Anastasia".

His aunt is singer Anneli Sari, and his grandfather vuorineuvos Juhani Pesonen.