Baron Furuichi Kōi (古市 公威, September 13, 1854 – January 28, 1934) was a Japanese civil engineer, who was president of Kōka Daigaku, the present college of engineering of the University of Tokyo, and founding president of the Tokyo Underground Railway, "the first underground railway in the Orient".

[1][2] In 1854 he was born as a son of Furuichi Takashi a retainer of Sakai clan in Edo.

In 1869, he entered Kaisei gakkō, in 1870, he was elected student on scholarship in Himeji Domain, and entered Daigaku Nankō, then studied abroad to Ecole Centrale des Arts et Manufactures in Paris as the Ministry of Education first student studying abroad.

[4] He would join Noritsugu Hayakawa as president of the Tokyo Underground Railway in 1920, founding the first subway system in Asia.

This was a gesture of honour as Koi was a benefactor of Mishima grandfather's clan - Sadataro.