Lu Over the Wall is a 2017 Japanese animated fantasy film produced by Science Saru and released by Toho about the eponymous ningyo. It was directed by Masaaki Yuasa, and written by Yuasa and Reiko Yoshida. The music was composed by Takatsugu Muramatsu. It is the second Science Saru film, though it was the first to be produced.

Ningyo as the name suggests, is a creature with both human and fish-like features, described in various pieces of Japanese literature.