Gemini (stylized in promotional material as GEMINI) is the fourth studio album by Japanese visual kei rock band Alice Nine.

The DVD included with the limited edition of the album features a music video for "Gemini 0: Eternal" and a making-of documentary for the music video.

The title of the album refers to a theme of "duality", particularly opposing elements such as light versus shadow and birth versus death.

This theme is most prevalent in the trilogy of songs after which the album is named.

The album is their highest Oricon ranking release to date.