Slipknot and Black Sabbath will headline the first Ozzfest staged in Japan next May.

Ozzy Osbourne and his manager wife Sharon made the big announcement online on Thursday morning.

The news of the 11 and 12 May shows comes hours after Black Sabbath announced their first Australian tour in nearly 40 years.

Original band members Osbourne, Geezer Butler and Tony Iommi will perform concerts in Brisbane, Sydney, Melbourne and Perth in April.