Events from the year 1955 in Japan.
- January 28 – Benesse Corporation was founded, as predecessor name was Fukutake Shoten.[citation needed]
- February 17 - According to Japan Fire and Disaster Management Agency official confirmed report, Seibo no Sono (Our Lady's Garden) fire in Totsuka-ku, Yokohama, total 99 person were death.[page needed]
- February 27 - 1955 Japanese general election
- April Unknown date – Bunka Shutter was founded, as predecessor name was Nippon Bunka Steel Door.[page needed]
- April 7 - Radio Tokyo TV (now Tokyo Broadcasting System Television (TBS)) begins broadcasting.
- April 16–17 - Abe coal mine debris collapse, due to heavy torrential rain hit in Sasebo, Nagasaki Prefecture, resulting tn 73 persons death, according to JFDMA official confirmed report.[2]
- April 21 - Opening of Gokō Station
- May 11 - Shiun Maru disaster
- May 14 - According to Japan National Police Agency official confirmed report, a charter bus plunged into the Kitakami River in Iwate Prefecture, resulting in twelve deaths and twenty-eight injured.[page needed]
- July 28- According to JFDMA official confirmed report, 36 junior school students died when a high wave hit, during school swimming lesson in Nakakawara beach, Tsu, Mie Prefecture.[page needed]
- September 3 - Yumiko-chan incident
- November 1 - According to JFDMA official confirmed report, Moshiri Coal mine gas explosion hit in Akabira, Hokkaido, official death toll number is 60, with 17 person were wounded.[page needed]
- November 15 - Japan Liberal Party and Democratic Party of Japan were unified, ruling Liberal Democratic Party of Japan has started.[page needed]
- Establishment of Akkeshi Prefectural Natural Park
- January 13 - Ran Itō, actress
- January 15 - Mayumi Tanaka, voice actress
- January 17 - Mami Koyama, voice actress
- January 20 - Hiromi Ōta, singer
- January 22 - Keiko Takahashi, actress
- January 28 - George Tokoro, television personality and singer-songwriter
- February 12 - Ai Satō, voice actress
- February 13 - Akiko Yano, singer-songwriter
- March 2 - Shoko Asahara, cult leader (Aum Shinrikyo) (d. 2018)
- March 16 - Jiro Watanabe, boxer
- March 20 - Mariya Takeuchi, singer-songwriter
- April 5 - Akira Toriyama, Manga artist (d. 2024)[3]
- April 7 - Akira Nishino, soccer player and manager
- April 13 - Hideki Saijo, singer and actor (d. 2018)
- April 15 - Ryūtarō Nakamura, Anime director (d. 2013)
- April 23 - Fumi Hirano, voice actress and essayist
- April 29 - Yūko Tanaka, actress
- May 9 – Masayuki Kakefu, former professional baseball player
- May 24 - Rumiko Ukai, voice actress
- May 25 - Suguru Egawa, baseball player
- May 26 - Masaharu Morimoto, chef
- May 30 - Nakamura Kanzaburō XVIII, Kabuki actor (d. 2012)
- June 1 - Chiyonofuji Mitsugu, sumo wrestler (58th Yokozuna grand champion)
- June 26 - Yoko Gushiken, boxer
- July 1 - Sanma Akashiya, comedian and actor
- August 20 - Agnes Chan, television personality
- August 30 - Mayumi Muroyama, Manga artist
- September 4 - Hiroshi Izawa, actor
- September 24 - Shinbo Nomura, Manga artist
- October 18 - Hiromi Go, singer
- October 19 - LaSalle Ishii, television personality
- October 21 - Yasukazu Hamada, politician
- October 29 - Etsuko Shihomi, actress
- November 3 - Yukihiko Tsutsumi, film director
- November 14 - Koichi Nakano, bicycle rider
- December 9 - Asashio Tarō IV, sumo wrestler
- December 16 - Chiharu Matsuyama, singer-songwriter
- December 24 - Mizuho Fukushima, politician
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