Part of the Banchō area, Sanbanchō (三番町) is an upscale, mostly residential district of Chiyoda, Tokyo, Japan. As of June 2020, the population of this district is 3,666 in 1,707 households. It borders the Tokyo Imperial Palace and the Chidorigafuchi moats to the east, Nibanchō and Yonbanchō to the west, Ichibanchō to the south, and Kudanminami to the north.

Like Yonbanchō, its official English spelling, Sanbanchō, does not follow the Hepburn romanization standard.

Similarly to the rest of the Banchō area, Sanbanchō (三番町) was the site of residences of the Hatamoto soldiers in charge of guarding Edo Castle. Among those, the residence of Sano Masakoto (on present day site of Otsuma Women University), who became famous in 1784 by killing in the castle an unpopular government official.

In 1804, the Wagakukōdansho (和学講談所), (Institute of Lectures of Japanese classics), founded in 1793 and run by the blind scholar Hanawa Hokiichi was moved to Omote-Rokubancho, near nowadays Sanbancho-24. As the Shogunate was nearing its end, Omura Masujiro opened in 1856 Kyukyodo (鳩居堂), a rangaku institute in his residence, located next to nowadays Chidorigafuchi National Cemetery.

Tōgō Heihachirō moved to Banchō in 1881 and lived there for 54 years. The location of his residence is the Togo Gensui Memorial Park (東郷元帥記念公園).

The modern district was created on July 1, 1933, through a merger of the former districts of Ichibancho, Kami-Rokubancho and parts of Fujimicho 1-chome.

Sanbanchō was the subject of a famous Kyōka by Hanawa Hokiichi during Edo times.

番町に	Banchō ni	Banchō
過ぎたるものは	Sugitaru mono ha	can be summed up by
二つあり	Futatsu ari	two things
佐野の桜と	Sano no sakura to	the cherry blossoms of Sano
塙検校	Hanawa Kengyō	and Hanawa the blind

• Chidorigafuchi National Cemetery
• Chidorigafuchi Green Way
• Otsuma Women University
• Otsuma Junior and Senior Highschool
• Kudan Elementary School and Kindergarten
• Apostolic Nunciature
• Kudan campus of the Nishogakusha University
• Tokyo Kasei-Gakuin University
• Tokyo Kasei-Gakuin Junior and Senior Highschool
• All-Japan Band Association
• Togo Gensui Memorial Park

Chiyoda Board of Education [ja] operates public elementary and junior high schools. Kudan Elementary School (九段小学校) is the zoned elementary school for Sanbanchō. There is a freedom of choice system for junior high schools in Chiyoda Ward, and so there are no specific junior high school zones.