Ganryūjima (巌流島?, (formerly Funajima 船島))
is an island in Japan located between Honshū and Kyūshū, and accessible via ferry from Shimonoseki Harbor (下関港). It is famous for the duel between Miyamoto Musashi and Sasaki Kojirō. The small island was first named for its boat-like appearance, and later after the Ganryū kenjutsu school Kojirō had founded.

On the island are a few monuments as well as facilities for public gatherings such as an annual tug-of-war. Along the west coast is a walking path, while the other side remains fenced off.