Lanxi Daolong (c. 1213-1278), born in Sichuan Province, China in 1213 (Southern Song Dynasty), is a famous Chinese Buddhist monk, calligrapher, idealist philosopher, and is the founder of the Kenchō-ji sect, which is a branch of the Rinzai school.

He enters temple life at the age of thirteen.

Due to the Mongol Conquest of the Song Dynasty in China in 1246, also driven by the new trend that Zen monks of the Southern Song Dynasty increasingly tend to voluntarily go to Japan to preach Zen Buddhism, plus the influences of his teachers and friends, he sails to Japan to preach Zen Buddhism, and later moves to Kamakura, where he takes charge of Kenchō-ji, after having accepted the invitation of Hōjō Tokiyori in 1253.

His calligraphy is famous in Japan, especially Rule of Zen.

Daolong dies in Kenchō-ji, and is given the Posthumous Name as Dajue Zen Master by Emperor Go-Uda.

Throughout his lifetime, he makes great contributions to promote Sino-Japanese cultural interactions.