List of Japanese authors
- Obata Tokujiro (January 1,1842 - January 1,1905)
- Ochiai Naobumi (November 15,1861 - December 16,1903)
- Oda Masanobu (December 16,1903 - September 11,1945)
- Oda Sakunosuke (October 26,1913 - January 10,1947)
- Oe Kenzaburo (born 1935)
- Ogata Kamenosuke (December 12,1900 - December 2,1942)
- Ogawa Masako (March 26,1923 - April 29,1943)
- Ogawa Ryosaku (born 1951)
- Ogawa Takuji (May 28,1870 - November 15,1941)
- Ogiwara Morie (December 1,1879 - April 22,1910)
- Ogiwara Rokuzan (December 1,1879 - April 22,1910)
- Oguma Hideo (September 9,1901 - November 20,1940)
- Ogura Shinpei (June 4,1882 - February 8,1944)
- Oguri Fuyo (February 3,1875 - January 15,1926)
- Oguri Mushitaro (March 14,1901 - February 10,1946)
- Ohashi Otowa (June 4,1869 - June 1,1901)
- Ohashi Shintaro (July 29,1862 - May 5,1944)
- Oka Fumoto (March 3,1877 - September 7,1951)
- Oka Kyujuro (December 26,1897 - May 17,1949)
- Oka Onitaro (August 1,1872 - October 29,1943)
- Okada Jitsumaro (February 1,1878 - August 18,1943)
- Okakura Tenshin (December 26,1862 - September 2,1913)
- Okakura Yoshisaburo (February 22,1868 - October 31,1936)
- Okamoto Ippei (June 11,1886 - October 11,1948)
- Okamoto Kanoko (March 1,1889 - February 18,1939)
- Okamoto Kido (October 15,1872 - March 1,1939)
- Okamura Kintaro (April 10,1867 - August 21,1935)
- Okamura Shiko (September 14,1881 - May 6,1925)
- Okano Chiju (February 19,1860 - August 13,1932)
- Okano Kaoru (February 20,1893 - December 12,1941)
- Okkotsu Saburo (May 17,1881 - September 19,1934)
- Okochi Suizan (February 5,1880 - November 18,1938)
- Oku Yoshiisa (September 20,1858 - March 9,1933)
- Okubo Yu (born 1982)
- Okura Toro (November 17,1879 - April 22,1944)
- Omachi Keigetsu (January 24,1869 - June 10,1925)
- Omori Gitaro (September 26,1898 - July 28,1940)
- Onishi Hajime (August 7,1864 - November 2,1900)
- Ono Hiroshi (June 29,1894 - October 21,1933)
- Ono Hisatora (October 10,1884 - March 25,1931)
- Ono Ken'ichiro (July 1,1888 - February 1,1943)
- Ono Kozan (January 12,1814 - April 19,1910)
- Ono Masakata (August 3,1885 - January 19,1945)
- Ono Tadaaki (May 3,1895 - December 3,1929)
- Ono Takezo (March 16,1878 - March 5,1945)
- Onuma Satoru (June 17,1889 - October 18,1944)
- Ooka Shohei (March 6,1909 - December 25,1988)
- Ora Shin'ichi (April 30,1908 - January 4,1945)
- Orikuchi Shinobu (February 11,1887 - September 3,1953)
- Osaka Keikichi (March 20,1912 - July 2,1945)
- Osanai Kaoru (July 26,1881 - December 25,1928)
- Osatake Takeshi (January 20,1880 - October 1,1946)
- Oshikawa Shunro (March 21,1876 - November 16,1914)
- Oshima Masanori (November 11,1880 - April 21,1947)
- Oshima Ryokichi (September 4,1899 - March 25,1928)
- Osuga Otsuji (July 29,1881 - January 20,1920)
- Osugi Sakae (January 17,1885 - September 16,1923)
- Ota Gyokumei (May 6,1871 - April 6,1927)
- Otani Kubutsu (February 27,1875 - February 6,1943)
- Ote Takuji (December 3,1887 - April 18,1934)
- Otsuka Kusuoko (August 9,1875 - November 9,1910)
- Otsuki Fumihiko (November 15,1847 - February 17,1928)
- Owada Takeki (April 29,1857 - October 1,1910)
- Oyanagi Shigeta (November 3,1870 - July 18,1940)
- Ozaki Hosai (January 20,1885 - April 7,1926)
- Ozaki Hotsumi (May 1,1901 - November 7,1944)
- Ozaki Koyo (January 10,1867 - October 30,1903)
- Ozawa Mariko