Quantum is the third studio album by instrumental rock/progressive metal supergroup Planet X, released in 2007 through Inside Out Music.

[1] Guitarist Allan Holdsworth was originally slated to feature on most tracks, but ended up not finishing the project.

[2] As a result, his solos remain only on "Desert Girl" and "The Thinking Stone".

François Couture at AllMusic gave Quantum four stars out of five, calling it "a quantum leap above previous Planet X releases" and "a surprisingly mature album".

He praised the album's stronger compositions and better diversity over previous Planet X material, and listed "Alien Hip Hop", "Matrix Gate", "Space Foam", "Kingdom of Dreams" and "Desert Girl" as highlights.