Gianizm (ジャイアニズム, Jaianizumu) is one of Nightmare's 10th anniversary albums, released on January 1, 2010.

The album is a compilation of all the "Gianizm" tracks, including two new Gianizm tracks never before released.

All tracks have been re-recorded for the album, excluding Shichi, Hachi, and Kyuu.

The DVD included with the limited edition contains a video for each track.

The album peaked at #19 in the Oricon chart,[2] selling 18,201 copies in the first week (20,914 total reported sales).