Masaaki Tachihara (立原 正秋, Tachihara Masaaki, Korean: 金胤奎, 김윤규, Kim Yun Kyu, January 6, 1926 – August 12, 1980) was a Japanese novelist, essayist, poet, and editor from the Korean Peninsula. He was born in the Korean city of Andong, Gyeongsangbuk-do province, to Korean parents. He was naturalized Japanese in 1947.