Discworld-series: Discworld books: Non-Discworld Books:
 1.  The Colour of Magic
 2.  The Light Fantastic
 3.  Equal Rites
 4.  Mort
 5.  Sourcery
 6.  Wyrd Sisters
 7.  Pyramids
 8.  Guards! Guards!
 9.  Eric
10. Moving Pictures
11. Reaper Man
12. Witches Abroad
13. Small Gods
14. Lords and Ladies
15. Men at Arms
16. Soul Music
17. Interesting Times
18. Maskerade
19. Feet of Clay
20. Hogfather
21. Jingo
22. The Last Continent
23. Carpe Jugulum
24. The Fifth Elephant
25. The Truth
26. Thief of Time
27. Nightwatch
28. Monstrous Regiment
29. Going Postal
30. Thud!
The Last Hero
The Amazing Maurice and His Educated Rodents
The Wee Free Men
A Hat Full of Sky
Where's My Cow?

The Art of Discworld
Nanny Ogg's Cookbook
The 2004 Short Story Collection
The 2004 Discworld Novel
The Discworld Companion
The Science of Discworld
The Science of Discworld II: the Globe
The Science of Discworld III: Darwin's Watch
The Streets of Ankh-Morpork
The Discworld Mapp
A Tourist Guide to Lancre
Death's Domain

Good Omens - with Neil Gaiman
The Dark Side of the Sun
The Carpet People
The Unadulterated Cat

The Bromeliad:

The Johnny Maxwell books:
Only You Can Save Mankind
Johnny and the Dead
Johnny and the Bomb