Koishikawa (小石川?) is a locality within Bunkyo, Tokyo. It consists of five sub-areas, 1-5 chome (1~5丁目?). It is located nearby with the same name are two well regarded gardens: the Koishikawa Botanical Garden (related to Tokyo University) in Hakusan, and the Koishikawa Korakuen Garden in Korakuen.
Bunkyo operates the local public elementary and middle schools.