Ichitarō Doi (土居 市太郎, doi ichitarō, November 20, 1887 – February 28, 1973) was a Japanese professional shogi player who achieved the rank of 8-dan (the highest rank at the time), and was the first president of the Japan Shogi Association.
Doi was a student of Kinjirō Sekine [ja], the thirteenth Lifetime Meijin, along with contemporary colleagues Yoshio Kimura, Yasujirō Kon, Chōtarō Hanada, and Tōichi Watanabe.
Born in Matsuyama, Doi eventually moved to the Yūrakuchō district in Tokyo.
[4] In 1921, Doi lead his own group of players known as the 東京将棊同盟社 while the other two sects in Tokyo were led by Sekine (the 東京将棊倶楽部) and Kumao Ōsaki (the 東京将棊研究會).
After the organization changed its name to the Japan Shogi Federation (日本将棋連盟, nihon shōgi renmei) in 1927, Doi became the president of guild again in 1932.