Cthulhu Classics is a collection of adventures for Call of Cthulhu.

The centerpiece is "Shadows of Yog-Sothoth", a seven-part campaign that reveals details of the Silver Twilight, an international organisation dedicated to prematurely forcing the rise of R'lyeh and the release of dread Cthulhu. Five additional adventures explore the impact of the Mythos on the natural world.

This book contains:
- Shadows of Yog-Sothoth
- the Warren
- the Pits of Bendal-Dolum
- the Temple of the Moon
- Dark Carnival
- the Secret of Castronegro

These adventures appeared in previous CoC publications: Shadows of Yog-Sothoth, Cthulhu Companion, Curse of the Cthonians and Terror from the Stars.