Oin Junior and Senior High School 桜蔭中学校・高等学校 Schola Media et Summa Oinensis
Location
1-5-25, Hongo, Bunkyo, Tokyo, Japan 113-0033
Information
Funding type	Private
Mottoes	勤勉 ・温雅 ・聡明であれ 責任を重んじ、礼儀を厚くし、よき社会人であれ (Diligence, refinement and intelligence Respect for responsibility and an unfailingly courteous manner make for good citizens)
Established	23 April 1924

Oin Junior and Senior High School (桜蔭中学校・高等学校) is a private girls' school located in Hongo, Bunkyo, Tokyo that provides six-year secondary education programmes.

The school was founded in 1924 by members of the alumnae club of Tokyo Women's Normal School, Oin-kai (櫻蔭会). The first principal of the school, Kikuno Gokan (後閑菊野), had been responsible for the education of Empress Kojun, and she placed focus on manners in the creation of Oin as well.^[1]

Oin is known as one of the most selective secondary educational institutions in the country, and is one of the largest sources of successful applicants to the University of Tokyo, which is usually regarded as the nation's most selective and prestigious university.^[2]

• Miki Yamada: Member of the House of Representatives (LDP)^[4]
• Mayuko Toyota: Former member of the House of Representatives (LDP)^[5]

• Oin Junior and Senior High School

35°42′13″N 139°45′24″E / 35.7036°N 139.7567°E / 35.7036; 139.7567