I've been trying to find every book with classes and/or subclasses so I can see what they are but I've been unable to find them all. Is anyone willing to help?

EDIT: updated as of 2025-12-01

Official 5e books with classes include:

• 2014 Player's Handbook
• 2024 Player's Handbook
• Eberron: Rising from the Last War and Tasha's Cauldron of Everything (they both have the same class, the old Artificer)
• Eberron: Forge of the Artificer (this has the new Artificer)

Official 5e books with subclasses include:

• 2014 Player's Handbook
• 2014 Dungeon Master's Guide
• 2024 Player's Handbook
• Bigby Presents: Glory of the Giants
• Dragonlance: Shadow of the Dragon Queen
• Eberron: Rising from the Last War
• Fizban's Treasury of Dragons
• Guildmaster's Guide to Ravnica
• Mythic Odysseys of Theros
• Sword Coast Adventurer's Guide
• Tasha's Cauldron of Everything
• Van Richten's Guide to Ravenloft
• Xanathar's Guide to Everything
• Forgotten Realms: Heroes of Faerûn
• Eberron: Forge of the Artificer

There are also several third-party "partnered content" books on D&D Beyond that include subclasses, but these aren't usually considered official D&D content.

thank you

Does anyone know what the "unofficial" subclass books are?

Quote from Duchess_of_Valnheim >>

Does anyone know what the "unofficial" subclass books are?

 There are more than you could list, I would bet.

If you include the HomeBrew subclasses found on DDB, there are more than enough to keep you busy.