Kudanminami (九段南) is a district of Chiyoda, Tokyo, Japan, consisting of 1-chōme to 4-chōme. As of March 1, 2007, its population is 2,431. Its postal code is 102-0074. 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. In addition, it borders Kitanomaru Kōen between its 1-chōme and 2-chōme.