1921 in Japan
Events from the year 1921 in Japan. It corresponds to Taishō 10 in the Japanese calendar.
Incumbents
Governors
- Aichi Prefecture: Shunji Miyao ; Hikoji Kawaguchi
- Akita Prefecture: Ryoshin Nao
- Aomori Prefecture:
- * until 9 March: Hidehiko Michioka
- * 9 March-28 September: Shundo Kahei
- * starting 28 September: Yujiro Ozaki
- Ehime Prefecture: Toshio Mawatari ; Juunosuke Miyazaki
- Fukui Prefecture: Kohei Yuji ; Josuke Shiraogawa
- Fukuoka Prefecture: Yasukouchi Asakichi
- Fukushima Prefecture: Miyata Mitsuo
- Gifu Prefecture: Kanokogi Kogoro ; Manpei Ueda
- Gunma Prefecture: Muneyoshi Oshiba
- Hiroshima Prefecture: Raizo Wakabayashi ; Ichiro Yoda
- Ibaraki Prefecture: Yuichiro Chikaraishi ; Genjiro Moriya
- Iwate Prefecture: Takeo Kakinuma
- Kagawa Prefecture: Yoshibumi Satake
- Kochi Prefecture: Abe Yoshihiko
- Kumamoto Prefecture: Hikoji Kawaguchi ; Sansuke Nakayama
- Kyoto Prefecture: Eitaro Mabuchi ; Raizo Wakabayashi
- Mie Prefecture: Haruki Yamawaki
- Miyagi Prefecture: Mori Masataka ; Yuichiro Chikaraishi
- Miyazaki Prefecture: Naomiki Hirose ; Goro Sugiyama
- Nagano Prefecture: Tenta Akaboshi ; Tadahiko Okada
- Niigata Prefecture: Ota Masahiro
- Okayama Prefecture: Masao Kishimoto
- Okinawa Prefecture: Sōsuke Kawagoe ; Jyun Wada
- Saga Prefecture: Sawada Ushimaro ; Tominaga
- Saitama Prefecture: Horiuchi Hidetaro
- Shiname Prefecture: Sanehide Takarabe
- Tochigi Prefecture: Hiroyoshi Hiratsuka
- Tokushima Prefecture: Rinpei Otsu
- Tokyo: Hiroshi Abe ; Katsuo Usami
- Toyama Prefecture: Higashizono Motomitsu ; Shida Jisho
- Yamagata Prefecture: Ichiro Yoda ; Morimoto Izumi
- Yamanashi Prefecture: Miki Nagano
Events
- January 15 - Mitsubishi Electronics was separate section from Mitsubishi Shipbuildings which was founded in Ōsone, Nagoya.
- January Unknown date - Komatsu Limited was founded, as predecessor name was Komatsu Ironworks.
- September - Sempill Mission sent by Britain to Japan, with the objective of helping the Imperial Japanese Navy develop its aeronaval forces.
- October 16 - Janome Sewing Machine founded.
- November 4 - Prime Minister Hara Takashi is assassinated at Tokyo Station.
- November 12 - Washington Naval Conference opens at Memorial Continental Hall Hall in downtown Washington DC.
- November 25 - Crown Prince Hirohito is made regent in place of his ailing father.
- December 13 - In the Four-Power Treaty on Insular Possessions, Japan, the United States, United Kingdom, and France agree to recognize the status quo in the Pacific.
- Termination of Anglo-Japanese Alliance.
- Ladies' Agreement
- Unknown date - Otsuka Pharmaceutical founded in Naruto, Shikoku Island.
Births
- January 3 - Natsuko Kahara, actress
- January 26 - Akio Morita, businessman and co-founder of Sony Corporation
- February 9 - Junzo Shono, writer
- February 11 - Edward Seidensticker, scholar, historian, and translator
- February 14 - Toshiko Taira, textile artist
- March 19 - Heitaro Nakajima, engineer
- April 20 - Michiko Inukai, writer and philanthropist
- December 20 - Kosuke Gomi, novelist
Deaths
- January 13 - Ijuin Gorō, admiral
- June 19 - Nabeshima Naohiro, politician and former daimyō
- September 28 - Yasuda Zenjirō, entrepreneur, founder of the Yasuda zaibatsu
- November 4 - Hara Takashi, Prime Minister of Japan
- November 5 - Yusuke Hashiba, archaeologist, historian and anthropologist
- December 29 - Hayashi Yūzō, politician