1925 in Japan

Incumbents

• Emperor: Taishō
• Regent: Hirohito
• Prime Minister: Katō Takaaki

  Events

• January 20 - Soviet–Japanese Basic Convention is signed between the Empire of Japan and the Soviet Union. Ratifications were exchanged in Beijing on February 26, 1925. The agreement was registered in the League of Nations Treaty Series on May 20, 1925.
• March 7 - The Public Security Preservation Law of 1925 is passes in the diet. It forbade conspiracy and revolt, and it criminalized socialism and communism. It was one of the most significant laws of pre-war Japan.
• March - A nation's first license radio station, NHK Radio One, an official broadcasting service start in Tokyo, following start on June 1 in Osaka and July 15 in Nagoya.
• April Unknown date - Sanki Engineering was founded.
• May 1 - Matsuya Department Store of Ginza was open in Tokyo.
• May 5 - The General Election Law was passed, giving all men above age 25 the right to vote.
• May 12 - The Public Security Preservation Law is enacted.
• May 23 - 1925 Kita Tajima earthquake
• November 13 - The University of Tokyo Earthquake Research Institute is founded.
• Unknown date - Hokkaido Dairy Sales Association, as predecessor of Snow Brand Megmilk, founded in Hokkaido.

  Births

• January 11 - Kihachirō Kawamoto, film director, screenwriter and animator
• January 14 - Yukio Mishima, author, poet, and playwright
• January 28 - Yasuji Mori, animator
• February 17 - Shoichiro Toyoda, business executive
• February 26 - Hitoshi Takagi, voice actor
• March 12 - Leo Esaki, physicist, Nobel laureate
• July 12 - Yasushi Akutagawa, composer and conductor
• November 30 - Genshō Imanari, literature academic
• December 6 - Shigeko, Princess Teru, later "Shigeko Higashikuni", eldest child of Emperor Shōwa

  Deaths

• January 4 - Hirase Sakugorō, botanist and painter
• January 8 - Uemura Masahisa, Christian pastor and theologian
• April 14 - Hirata Tosuke, politician and Lord Keeper of the Privy Seal of Japan
• May 21 - Hidesaburō Ueno, agricultural scientist
• May 25 - Yoichirō Hirase, malacologist
• September 25 - Hamao Arata, politician
• September 30 - Inō Kanori, anthropologist and folklorist