Hayashi Tōji Arimichi (林 藤次 有通, 1797–1870) was a Japanese nationalist, priest, scholar of kokugaku, and Shinto fundamentalist. He was also a physician and military strategist. He is most often known by the pseudonyms Hayashi Ōen (林 桜園) or, rarely, Hayashi Tsūten (林 通天).