Johan De Farfalla (born June 3, 1971 in Stockholm) is a Swedish bass player. He is the former bassist of seminal Swedish metal band Opeth.De Farfalla originally joined Opeth in 1991 when its lineup was David Isberg on vocals, Mikael Åkerfeldt and Kim Pettersson on guitar, and Anders Nordin on drums. He replaced Nick Döring on bass for one show and quit immediately afterwards.