Morita Yonematsu (19 March 1881 – 14 December 1949; Japanese: 万戸 満平), known under pen name Morita Sōhei (Japanese: 森田 草平, もりた そうへい), was a novelist and translator of Western literature active during the late Meiji, Taishō and early Shōwa periods of Japan.

At the age of 15, he was selected for the Imperial Japanese Navy's preparatory course, and sent to boarding school in Tokyo.

Morita approached Yosano Tekkan, editor of the influential literary magazine Myōjō for assistance in an introduction to Natsume Sōseki in an effort to become accepted as one of Soseki's students.

Morita won critical acclaim and acceptance as a serious writer with his novel Baien (Smoke, 1909), a largely autobiographical account of his unhappy marriage, subsequent affair with Hiratsuka Raicho, and their unsuccessful attempt to commit double suicide in Nasushiobara, Tochigi.

In addition to his own writings, Morita translated the works of Fyodor Dostoevsky, Henrik Ibsen, Miguel de Cervantes, Gabriele D'Annunzio, and Giovanni Boccaccio into Japanese.