Iwamotochō (岩本町) is a district of Chiyoda, Tokyo, Japan.
The area consisting of both Iwamotochō and Kanda-Iwamotochō borders Kanda-Sakumakaji and Kanda-Sakumachō to the north; Higashi-Kanda to the east; Nihonbashi-Kodenmachō and Nihonbashi-Honchō, Chūō to the south; and Kanda-Sudachō, Kanda-Higashimatsushitachō, Kanda-Higashikonyachō, Kanda-Konyachō, Kanda-Nishifukudachō and Kanda-Mikurachō to the west.
Iwamotochō, located east to the avenue, has already undergone modernization of the addressing system while, in Kanda-Iwamotochō, located west to the avenue, the modernization has not been enforced yet.
Iwamotocho Station is located on the border between the Kanda-Iwamotochō and Iwamotochō districts.
Chiyoda Board of Education [ja] operates public elementary and junior high schools.