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| 1921, March–Aug |
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| The world tour of Crown Prince Hirohito marked the first time a member of the imperial family had been abroad. | 1 |
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| Nov. 4 |
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| Prime Minister Hara was murdered by a political fanatic. | 2 |
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| Nov. 12 |
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| Takahashi Korekiyo (1854–1936) became prime minister. | 3 |
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| Nov. 12–1922, Feb. 6 |
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The Washington Conference met. Adm. Kat Tomosabur (1861–1923), Shidehara Kij r (1872–1951), and Prince Tokugawa were the delegates from Japan. By these accords, Japan agreed to build no more three vessels for every five constructed by the U.S. and five by Great Britain. | 4 |
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| Nov. 25 |
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| Crown Prince Hirohito became regent because of the illness of the emperor. | 5 |
| A shipyard strike in Kbe succeeded in winning an eight-hour workday, which was later extended to laborers in other heavy industries. | 6 |
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