Mori Tetsuzan (1775-1841) was a painter of the late Edo period. Born in Osaka. He was the eldest son of Shuho. He was adopted by his uncle Mori Sosen when he was in his teens. He succeeded to the Mori school. He became a pupil of Maruyama Okyo in his later years and is counted among the ten philosophers of Okyo. He went to Edo and introduced Kyoto-style painting to Edo. Later, he returned to Osaka and became a vassal of the Hosokawa clan, the feudal lord of Kumamoto.