In the Name of the Mermaid Princess (Japanese: ミオの名のもとに, Hepburn: Mio no Na no Moto ni) is a Japanese manga series written by Yoshino Fumikawa and illustrated by Miya Tashiro.

It was serialized in Shueisha's shōjo manga magazine Ribon from December 2020 to March 2023, with its chapters collected in seven tankōbon volumes.

Written by Yoshino Fumikawa and illustrated by Miya Tashiro, In the Name of the Mermaid Princess was serialized in Shueisha's shōjo manga magazine Ribon from December 1, 2020,[2] to March 16, 2023 (finished in the magazine's Spring 2023 extra issue).

[3] Shueisha collected its chapters in seven tankōbon volumes, released from June 24, 2021,[4] to March 24, 2023.

[5] The manga is licensed for English release in North America by Viz Media.