Aquarius is the debut studio album by English progressive metal band Haken. Despite the band having released two previous demos, none of the multiple songs already recorded were re-released on this album. A 22-minute medley of the whole album, except for the song "Sun", was included in their live album L-1VE.

Haken are an English progressive metal band formed in 2007 by multi-instrumentalist Richard Henshall, guitarist Matthew Marshall, and vocalist Ross Jennings. While Henshall, Marshall, and Jennings first had the idea of forming Haken in 2004, they opted to pursue their instruments and songwriting first. Upon recruiting other members three years later, they eventually released the demo Enter the 5th Dimension in 2008, signing with Sensory Records and releasing their first album Aquarius in 2010. As of 2023, they have released seven studio albums, two EPs, and two live albums.