Events from the year 1975 in Japan. It corresponds to Shōwa 50 (昭和50年) in the Japanese calendar.

• Emperor: Hirohito^[1]
• Prime Minister: Takeo Miki (Liberal Democratic)
• Chief Cabinet Secretary: Ichitaro Ide
• Chief Justice of the Supreme Court: Tomokazu Murakami
• President of the House of Representatives: Shigesaburō Maeo
• President of the House of Councillors: Kenzō Kōno
• Diet sessions: 75th (regular session opened on December 27, 1974, to July 4), 76th (extraordinary, September 11 to December 25), 77th (regular, December 27 to May 24, 1976)

• January 1 – A hotel bus plunges into Lake Aoki in Nagano Prefecture, killing 24.
• March 10 – Sanyo Shinkansen officially open between Okayama Station to Hakata Station of Fukuoka.^{[page needed]}
• July 20 – opening of Expo '75 in Okinawa.
• August 6 – According to Japanese government official confirmed report, a heavy massive rain, following debris flow hit in Mount Iwaki in Nakatsugaru District (present day of Hirosaki), Aomori Prefecture, kill 21 persons with injure 31 persons.^[2]
• August 17–18 – Typhoon Phyllis, where hit on landslide, debris flow, flood swept hit in Kochi Prefecture, Shikoku Island, killing 77 persons and 209 persons injures, according to Japan Fire and Disaster Management official confirmed report.^{[citation needed]}
• November 2–8 – 1975 Japan Open Tennis Championships held in Tokyo.
• November 3 – Miss International 1975 held at Expo Portside Theater, Motobu, Okinawa.
• November 26 to December 3 – Japanese National Railways mandatory implementation an eight-day-long illegal "strike for the right to strike".^[3]
• December 12 – In Osaka International Airport of Itami, where takeoff and landing of civilian aircraft before 7 o'clock and after 21 o'clock was forbidden, that caused by noise complaints from residents triggered.^[4]
• December 31 – 17th Japan Record Awards held in Tokyo.

• Banned Book: Flesh Futon
• Cruelty: Black Rose Torture
• Dersu Uzala, directed by Akira Kurosawa
• Graveyard of Honor, directed by Kinji Fukasaku
• Hans Christian Andersen's The Little Mermaid, directed by Tomoharu Katsumata
• Kamen Rider Amazon
• Kamen Rider Stronger
• Karayuki-san, the Making of a Prostitute, directed by Shohei Imamura
• Oryu's Passion: Bondage Skin
• The Return of the Sister Street Fighter, directed by Kazuhiko Yamaguchi
• Terror of Mechagodzilla, directed by Ishirō Honda
• Tokyo Emmanuelle
• Tora-san's Rise and Fall, directed by Yoji Yamada
• Tora-san, the Intellectual, directed by Yoji Yamada
• A Woman Called Sada Abe, directed by Noboru Tanaka

• January 1 – Eiichiro Oda, illustrator and author (One Piece)
• January 6 – Yukana, voice actress and singer
• January 8 – Reiko Chiba, actress
• January 28 – Hiroshi Kamiya, voice actor
• January 30 – Yumi Yoshimura, singer (Puffy Amiyumi)
• February 6 – Tomoko Kawase, singer
• February 16 – Nanase Aikawa, singer
• February 17 – Michiko Kichise, actress
• February 10 – Hiroki Kuroda, baseball pitcher
• February 25 – Chiemi Chiba, voice actress
• April 3
  • Koji Uehara, baseball pitcher
  • Yoshinobu Takahashi, professional baseball player
• April 14 – Takayoshi Tanimoto, singer
• April 16 – Megumi Ōhara, voice actress
• April 27 – Kazuyoshi Funaki, ski jumper
• May 19 – Mitsutoshi Shimabukuro, manga artist (Seikimatsu Leader den Takeshi!, Toriko)
• May 26 – Tsuruno Takeshi, actor and singer
• June 22 – Yuka Itaya, actress
• July 5 – Ai Sugiyama, tennis player
• July 11 – Riona Hazuki, actress
• July 22 – Kenshin Kawakami, baseball pitcher
• August 1 – Ryoko Yonekura, actress
• August 11 – Kishō Taniyama, voice actor
• August 24 – Hayato Sakurai, martial artist
• August 28 – Yūko Gotō, voice actress
• September 6 – Ryoko Tani, judoka
• November 11 – Daisuke Ohata, rugby union player
• November 15 – Hiromi Ominami, long-distance runner
• November 16 – Yuki Uchida, actress
• December 12 – Kuwashima Houko, voice actress
• December 15 – Haruna Ikezawa, actress and voice actress
• December 16 – Masaki Sumitani, television performer
• December 30 – Yoma Komatsu, singer

• February 11 – Hideo Shinojima, footballer (b. 1910)
• May 30 – Tatsuo Shimabuku, martial artist and founder of Isshin-ryu karate (b. 1908)
• June 3 – Eisaku Satō, Prime Minister of Japan, recipient of the Nobel Peace Prize (b. 1901)^[5]
• November 19 – Tokushichi Mishima, inventor and engineer (b. 1893)

• 1975 in Japanese television
• List of Japanese films of 1975