|This article relies largely or entirely upon a single source. (February 2013)|
Hotsumi Ozaki (尾崎 秀実 Ozaki Hotsumi?, April 29, 1901 – November 7, 1944) was an Imperial Japanese journalist working for the Asahi Shinbun newspaper, communist, Soviet intelligence agent, and an advisor to Prime Minister Fumimaro Konoe. The only Japanese person to be hanged for treason (under the guise of the Peace Preservation Law) by the Imperial Japanese government during the World War II, Ozaki is well known as an informant of the Soviet agent Richard Sorge. He wrote letters to his wife and daughter while imprisoned, published as Love is like a Shower of Stars.
Ozaki was born in what is now the town of Shirakawa, Gifu Prefecture, and a descendant of a samurai family. His family relocated to Taiwan when he was a youth, and he grew up in Taipei. He returned to Japan in 1922, and enrolled in the Legal department of Tokyo Imperial University. Appalled by the actions of the government in the aftermath of the 1923 Great Kantō earthquake he turned to Marxism. He left school without graduating in 1925, after becoming involved in the activities of the Japan Communist Party. In 1926, he joined the Asahi Shimbun newspaper, where he wrote articles on Soviet leaders Vladimir Lenin and Joseph Stalin. He was transferred to the Osaka Mainichi Shimbun the following year.
From November 1928, Ozaki was dispatched to Shanghai in China, where he soon made contact with members of the Chinese Communist Party, including Agnes Smedley, and other members of the Comintern leadership based in Shanghai. Smedley introduced him to Richard Sorge in 1930. He was critical of Japan's war with China. He spent his life working on the question "Why should the success of the Chinese revolution be to Japan's disadvantage?". After his return to Japan, he moved back to Tokyo in 1934 where he linked up with Sorge.
By writing books and articles Ozaki established himself as an expert in Sino-Japanese relations. Thus he was recruited by Ryūnosuke Gotō in 1937 to join the Shōwa Kenkyūkai, a think tank established by Prime Minister Fumimaro Konoe. From 1938, he was invited by Konoe to become a member of his inner circle, or “Breakfast Club”, of select members with whom he would confer on current events each week over breakfast. Ozaki, therefore, was in a position to participate in the making of decisions he was supposed to uncover.
Ozaki learned that Japan wanted to avoid a war with the Soviet Union, and let Sorge know of it. This information proved to be of uttermost importance for the whole history of the Second World War: after Sorge relayed it to Soviet command, Moscow transferred 18 divisions, 1,700 tanks, and over 1,500 aircraft from Siberia and the Far East to the Western Front against the Nazi Germany during the most dangerous months of the Battle for Moscow, one of the turning points of the whole war.
On July 2, 1941 Ozaki as a member of the "Breakfast Club" supported a critical decision for Japanese expansion towards the Dutch East Indies and Singapore and against Hitler's request to invade Siberia. He was outspoken in his opposition and concerns with regards to the decision reached at the Gozen Kaigi conference of September 6, 1941 that war with the United States was unavoidable.
On October 15, 1941, Ozaki was arrested in conjunction with the Sorge Incident. During his trial, it was revealed that Ozaki had been working with Sorge since his return to Japan, and that through his close contacts with Konoe and other senior Japanese politicians, was able to gather information and to copy secret documents.
Prior to his imprisonment, Ozaki had been unfaithful, and secretive to his wife Eiko. She knew nothing about his espionage work until he was arrested. His time in prison led him to rekindle his relationship with Eiko as well as his daughter Eiko Yoko.  In his prison letters to his wife, he also described Agnes as a "friend".
He was convicted in a secret trial. He was executed on November 7, 1944.
Ozaki served a popular need for icons of Japanese suffering. Viewed as, along with the many soldiers, and civilians, a victim of militarism. Takada Tadashi, the judge who sentenced Ozaki to death in 1944, privately stated after the secret trial that he regarded Ozaki as not merely a man of virtue and ideals, but as a model patriot. 
On the first anniversary of Ozaki's death in the fall of 1945, Ozaki's friends honored him with a ceremony at which they called him a national martyr murdered by Japanese militarists and fascists.
- Johnson, Chalmers. An Instance of Treason Ozaki Hotsumi and the Sorge Spy Ring. Stanford CA: Stanford University Press, Expanded edition 1990 ISBN 0-8047-1766-4 is the standard biography in English and also contains a wealth of information, much of it from a Japanese perspective, about Richard Sorge and his other collaborators.
- Whymant, Robert. Stalin's Spy: Richard Sorge and the Tokyo Espionage Ring. New York: St. Martin's Press, 1996. This is the latest book-length study of the Sorge ring and Ozaki in English.
In the arts
- No Regrets for Our Youth Nie żałuję swojej młodości(わが青春に悔なし) is a Japanese film loosely based on Ozaki, written and directed by Akira Kurosawa.
- In the 2003 film Spy Sorge, directed by Masahiro Shinoda and based on the life of Richard Sorge, Ozaki is played by Masahiro Motoki.
- Kinoshita Junji 木下順二, A Japanese Called Otto オットーと呼ばれる日本人. This play, centered on Ozaki, was first performed in 1962 and has been produced in Japan a number of times since, most recently in 2008. An English translation by Lawrence Rogers was published in Patriots and Traitors: Sorge and Ozaki: A Japanese Cultural Casebook, Merwin Asia, 2009.
- Phillip Knightley. The Second Oldest Profession. W. W. Norton & Co, 1986. pp. 186–93. ISBN 0-393-02386-9.
- http://www.jpri.org/publications/workingpapers/wp105.html#t5051 An Instance of Treason: Ozaki Hotsumi and the Sorge Spy Ring By Chalmers A. Johnson Page 5
- Embracing Defeat: Japan in the Wake of World War IIBy John W. Dower Page 193
- The Lives of Agnes SmedleyBy Ruth Price Page 375
- Embracing Defeat: Japan in the Wake of World War IIBy John W. Dower Page 194-195