Grand Blue (ぐらんぶる, Guranburu, known as Grand Blue Dreaming in English) is a Japanese manga series written by Kenji Inoue and illustrated by Kimitake Yoshioka. It has been serialized in Kodansha’s seinen manga magazine good! Afternoon since April 2014 and has been collected in eighteen tankōbon volumes as of March 2022.

The manga is published digitally in English by Kodansha USA under the Kodansha Comics imprint. An anime television series adaptation by Zero-G aired from July to September 2018 in the Animeism programming block on MBS. A live-action film adaptation was released in August 2020.