Blue Hole (Japanese: ブルーホール, Hepburn: Burū Hōru) is a Japanese manga series written and illustrated by Yukinobu Hoshino.

A sequel, titled Blue World, was serialized in Monthly Afternoon from 1995 to 1997, with its chapters collected in four volumes.

The story is about the discovery of a gateway in time and space deep underwater which allows for travel between the present day and the age of the dinosaurs.

[3] Kodansha collected its chapters in two tankōbon volumes, released on August 8, 1992,[4] and February 3, 1993.

[5] A sequel, titled Blue World (新装版ブルー・ワールド, Burū Wārudo), was serialized in Monthly Afternoon from 1995 to 1997.