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.

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. The zone is a prestigious business and residential zone.

Kudanminami 1-chōme is situated on the easternmost part of the Kudanminami district. The Nishinomaru Park is situated to the west. This subdistrict is home to a number of office buildings, facilities, and public institutions.

• Chiyoda Ward Office
• Chiyoda Kaikan
• Kudan Kaikan
• Kudan Common Government Office Building
• Kudan Common Government Office Building No.2 (Tokyo Legal Affairs Bureau)
• Kudan Common Government Office Building No.3
• Aozora Bank Head Office
• Kudan Social Education Center
• Kudan Post Office
• Japan War-Bereaved Families Association headquarters

Kudanminami 2, 3 and 4 are part of the Banchō area.

The Nishinomaru Park is situated to the east. Kudanminami 3-chōme is situated to the west.

• Embassy of India
• Kudanzaka Hospital
• High School attached to Nishogakusha University
• Branch Government Office of the Ministry of Agriculture, Forestry and Fisheries
• Chidorigafuchi Moat Path

This subdistrict is situated on the west of Kudanminami.

This subdistrict is situated on the westernmost part of Kudanminami, bordering its 3-chōme to the east and Gobanchō to the west.

• Main branch of Nihon University
• Kōjimachi Post Office

Chiyoda Board of Education [ja] operates public elementary and junior high schools. Fujimi Elementary School (富士見小学校) is the zoned elementary school for Kudanminami 1-chōme while Kudan Elementary School (千代田区立九段小学校) is the zoned elementary school for Kudanminami 2-4 chōme.^[1] There is a freedom of choice system for junior high schools in Chiyoda Ward, and so there are no specific junior high school zones.^[2]