Kudanminami is a district of Chiyoda, Tokyo, Japan, consisting of 1-chōme to 4-chōme. As of March 1, 2007, its population is 2,431. Kudanminami is located on the northwestern part of the Chiyoda ward. The Nihonbashi River and Yasukuni-dōri Ave form its eastern and northern boundaries, respectively. It borders Kanda-Jinbōchō to the east, Gobanchō to the west, Sanbanchō, Hitotsubashi and Yonbanchō to the south, and Kudankita to the north.