Prince of Darkness is a box set of four CDs by Ozzy Osbourne released in 2005. The first two CDs are Osbourne's solo work, and the last two CDs are duets and cover songs.

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In 2002, Osbourne and wife Sharon were invited to the White House by president George W. Bush for a ceremonial dinner. Bush praised Osbourne for his work on The Osbournes.

During 2003, a member of Birmingham City Council campaigned for him to be given Freedom of the City.

On December 8, 2003, Osbourne was rushed into emergency surgery when he was involved in an accident involving the use of his all-terrain vehicle on his estate in Chalfont St Peter, Buckinghamshire, UK. Osbourne broke his collar bone, eight ribs, and a neck vertebra. An operation was performed to lift the collarbone, which was believed to be resting on a major artery and interrupting blood flow to the arm. Sharon later revealed that Osbourne had stopped breathing following the crash and was resuscitated by Osbourne's then personal bodyguard, Sam Ruston.

While in the hospital, Osbourne achieved his first ever UK number one single, a duet of the Tony Iommi-penned Black Sabbath classic "Changes" with daughter Kelly. In doing so, he broke the record of the longest period between an artist's first UK chart appearance (with Black Sabbath's, "Paranoid", number four in August 1970) and their first number one hit; a gap of 33 years.

Since the accident, he has fully recovered and headlined the 2004 Ozzfest, where he again reunited with Black Sabbath. He has also turned his hand to writing a Broadway musical. The reputed topic is that of the Russian monk Grigory Rasputin, who held sway with Russia's last royal Romanov family. In 2005, he released a box set called Prince of Darkness. It contains four long-awaited discs, the first and second discs are collections of live performances, B-sides, demos and singles. The third disc contained duets and other odd tracks with other artists, including "Born to Be Wild" with Miss Piggy. The fourth disc is entirely new material where Ozzy covers his favorite songs by his biggest influences and favorite bands, including The Beatles, John Lennon, David Bowie and others.