Natsume Sōseki , pen name Sōseki, born Natsume Kin'nosuke , was a Japanese novelist. He is best known for his novels Kokoro, Botchan, I Am a Cat, Kusamakura and his unfinished work Light and Darkness. He was also a scholar of British literature and writer of haiku and kanshi poetry and fairy tales.

Kokoro is a 1914 Japanese novel by Natsume Sōseki, and the final part of a trilogy starting with To the Spring Equinox and Beyond and followed by The Wayfarer. Set in the Meiji era, the novel tells of the acquaintance between a young man and an older man called "Sensei", who holds a secret from his past regarding the death of a friend.