The Nihonbashi Mitsui Tower (日本橋三井タワー) is a skyscraper located in Chūō, Tokyo, Japan.

The 192-metre, 34-storey building is primarily used for office space with the upper floors occupied by a hotel.

It is connected by an underground concourse to the Tokyo Metro Mitsukoshimae Station.

The tower site itself was previously occupied by Sembikiya (千疋屋), an importer and retailer of high-end fruits.

[1] The upper floors of the building, as well as some lobby space and lower-level ballrooms, are occupied by the Mandarin Oriental Tokyo.