Parallel Worlds: A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos is a popular science book by Michio Kaku first published in 2004.

Part II (Chapters 5–9) covers M-Theory and the "Many-Worlds interpretation" of Quantum Mechanics (Level III Multiverse).

Scarlett Thomas writing for The Independent calls Parallel Worlds "absolutely impossible to put down.

"[2] Mark Mortimer for Universe Today felt the book maintains a nice balance between detail and corollary while sometimes drifting to the philosophical side of things.

Gilmore praised the book for its "exotic physics" and felt there were "lots of intellectual challenge" but believed there "was a little too much of a pot-pourri."