Koishikawa

19th-century view of Koishikawa ("東京小石川遠景").
Japanese artillery unit, at the Koishikawa Arsenal, Tokyo, in 1882. Photographed by Hugues Krafft.

Koishikawa (小石川) is a district of Bunkyo, Tokyo. It consists of five sub-areas, 1-5 chome (1~5丁目). In Koishikawa are located two well regarded gardens: the Koishikawa Botanical Garden (operated by the University of Tokyo) in Hakusan, and the Koishikawa Korakuen Garden in Kōraku.

Train stations for accessing this locality include Hakusan Station (白山駅, Hakusan-eki), Kōrakuen Station (後楽園駅, Kōrakuen-eki), Kasuga Station (春日駅, Kasuga-eki), and Myōgadani Station.

The Koishikawa Arsenal was an important military installation during the Meiji era.