Note: There are other series with the same name: Diadem (Jo Clayton)
- Series: Diadem (John Peel) Series Record # 5169
- Webpages: web.archive.org
- Series Tags: young-adult fantasy (10)
- Diadem (John Peel)
- 1 Book of Names (1997) by John Peel
- 2 Book of Signs (1997) by John Peel
- 3 Book of Magic (1997) by John Peel
- 4 Book of Thunder (1997) by John Peel
- 5 Book of Earth (1997) by John Peel
- 6 Book of Nightmares (1998) by John Peel
- 7 Book of War (1997) by John Peel
- 8 Book of Oceans (2005) by John Peel
- 9 Book of Reality (2006) by John Peel
- 10 Book of Doom (2006) by John Peel
- 11 Book of Time (2012) by John Peel
- 12 Book of Games (2012) by John Peel
- Book of Time & Book of Games (2012) [O/11, 12] by John Peel