Iidabashi (飯田橋 Iidabashi) is a district of Chiyoda, Tokyo, Japan. It was in the former ward of Kōjimachi, which existed in Tokyo until 1947. Its postal code is 102-0072.
Iidabashi is named after a nearby bridge called Iida Bridge (飯田橋, Iidabashi), itself named after an Edo-period farmer, Iida Kihee (飯田喜兵衛, Iida Kihee).
Several companies have their headquarters in Iidabashi, among them Japan Freight Railway Company, KDDI Nikken Sekkei, and Shohakusha.
Coordinates: 35°42′09″N 139°44′41″E / 35.70250°N 139.74472°E