Original Series
1. Horrid Henry (1994)
2. Horrid Henry's Christmas (1995)
3. Horrid Henry's Perfect Day (1996)
4. Horrid Henry's Stinky Socks (1997)
5. Horrid Henry's Happy Birthday (1998)
6. Horrid Henry's School Trip (1999)
7. Horrid Henry's Big Fat Diary (2000)
8. Horrid Henry's Secret Diary (2001)
9. Horrid Henry's Holiday (2002)
10. Horrid Henry's Evil Plan (2003)
11. Horrid Henry's Mud Monster (2004)
12. Horrid Henry's Underpants (2005)
13. Horrid Henry's Best Friend (2006)
14. Horrid Henry's Lie (2007)
15. Horrid Henry's New Teacher (2008)
16. Horrid Henry's Game (2009)
17. Horrid Henry's Halloween (2010)
18. Horrid Henry's Best Mum in the World (2011)
19. Horrid Henry's Super Spy (2012)
20. Horrid Henry's Birthday Party (2013)
21. Horrid Henry's Big Mouth (2014)
22. Horrid Henry's Comic (2015)
23. Horrid Henry's New House (2016)
24. Horrid Henry's World Cup (2018)
Spin-offs
* Horrid Henry's Little Sister Series:
* Horrid Henry's Little Sister (2001)
* Horrid Henry's Little Sister Gets a Pet (2002)
* Horrid Henry's Little Sister Gets a Job (2003)
* Horrid Henry's Little Sister Goes to School (2004)
* Horrid Henry's Little Sister Gets a Boyfriend (2005)
* Horrid Henry's Friends Series:
* Horrid Henry's Friends (2008)
* Horrid Henry's Friends Go Camping (2009)
* Horrid Henry's Friends Go to School (2010)
* Horrid Henry's Friends Go to the Beach (2011)
* Horrid Henry's Diary Series:
* Horrid Henry's Big Fat Diary (2000)
* Horrid Henry's Secret Diary (2001)
* Other Spin-offs:
* Horrid Henry's Comic (2015)
Special Editions:
* Horrid Henry: The Complete Collection (2014)
* Horrid Henry: 20th Anniversary Edition (2014)
Note: Publication dates may vary slightly depending on the source. This list is based on information available from reliable sources such as Amazon and the official Horrid Henry website.