Ao no Honō (青の炎, The Blue Flame, internationally known as The Blue Light) is a 2003 Japanese film based on the novel of the same name by Yusuke Kishi, directed and co-written by Yukio Ninagawa, and starring Kazunari Ninomiya and Aya Matsuura. The film portrays Ninomiya playing Shūichi, a high school student finding a way to get rid of his stepfather who had returned home and begins to terrorize his family.

Ao no Honō was released in Japan on March 15, 2003 and was shown at the Cannes Film Festival in France on May 15, 2003.