The Book of Souls is the sixteenth studio album by English heavy metal band Iron Maiden, released on 4 September 2015. It is the band's first studio double album, and also their longest to date, with a total length of 92 minutes and 11 seconds. Its launch and supporting tour were delayed to allow vocalist Bruce Dickinson time to recover from the removal of a cancerous tumour in early 2015. It is also their first album to be released on Parlophone, since the end of their 30-year relationship with EMI Records.

Bruce Dickinson – vocals, piano on "Empire of the Clouds"
Dave Murray – guitars
Janick Gers – guitars
Adrian Smith – guitars
Steve Harris – bass, keyboards
Nicko McBrain – drums

Michael Kenney – keyboards
Jeff Bova – orchestration

Kevin Shirley – production, mixing
Steve Harris – co-production
Denis Caribaux – engineering
Ade Emsley – mastering
Chris Bellman – additional vinyl mastering
Stuart Crouch – art direction, design
Mark Wilkinson – cover illustration
Anthony Dry – disc illustrations
Julie Wilkinson – Maya codex drawings
Simon Martin – Maya hieroglyphs
Jorge Letona – Maya font design
John McMurtrie – photography
Rod Smallwood – management
Andy Taylor – management
Dave Shack – management