Masao Haji (土師 政雄, Haji Masao, September 27, 1925 – June 9, 1998) was a Japanese political activist, mathematics lecturer and critic. He also wrote books under the name Ryūsuke Nomi (野見隆介, Nomi Ryusuke). He was chair of mathematics at the correspondence-course "Z-kai", and taught at the three top exam preparation schools (juku): Yoyogi Seminar, Sundai Preparatory School and Kawai Juku Groupwork.

For many years, he was responsible for the "basic mathematics seminar" at Yoyogi exam preparation school. He was a lecturer in Oubun-Sha company's "University entrance exam radio". Oubun-Sha was the author of the "fundamental issues lecture" and "standard issue lecture" series and the author of "training" series of the Zoushin-kai Publishing House, such as Aleph's "Calculus Lab".

He gave counseling to young people, including homeless youth.

He graduated from the Department of Engineering of the University of Tokyo.

Haji graduated from the kyu-sei-ichi-koukou (currently, University of Tokyo liberal arts).

In his youth he suffered from tuberculosis and recovered but sometimes had hoarseness or cough.

He is buried in Aoyama cemetery in Minato-ku, Tokyo.^[1][2]

Haji was involved in the "Peace to Vietnam" committee.

• Masao Haji. "Han-sugaku-riron" (Futohsha, 1977) ISBN B000J8S3KC
• Masao Haji. "Koukou-muyou-no-Daigaku-Shingaku-Hou" (Sanichi-syobou, 1983) ISBN B000J7BLYS
• Masao Haji. "Sugaku1 Hyoujun-Mondai-seikou" (Oubun-sha, 1985) ISBN 978-4010313213
• Masao Haji. "Kisokaiseki-hyoujyun-mondai-seikou" (Oubun-sha, 1996) ISBN 978-4010313701

• Memorial texts collection of works from "44fragments of the surrounding Mr. Haji masao." By Yuichi Yoshikawa (in Japanese)
• "Meeting in memory of Mr. Haji masao." success. Facsimile edition of the book also 05 / July / 99 (in Japanese)