Nostradamus is the sixteenth studio album by English heavy metal band Judas Priest, focusing on the 16th-century writer Nostradamus. It is a double album. The band's first concept album with Rob Halford, it was originally intended to be released in late 2006 before being pushed back to a 2007 release, and was finally released in June 2008 on Epic Records. It is the band's final album to feature K. K. Downing, before his retirement.
The Nostradamus concept idea originated from manager Bill Curbishley and was pitched to the band while on tour in Estonia in 2005. Guitarist K. K. Downing revealed in a February 2007 interview with Brave Words & Bloody Knuckles that 18 tracks had been recorded with a total length of more than 90 minutes and that there was not much he would like to cut down. Musically, the album contains symphonic orchestrations, including the use of keyboards and choirs, which is unlike anything the band has previously attempted. In November 2007, the band began mixing the album.