Ohmatazawa Dam (Japanese: 大又沢ダム) is a gravity dam located in Kanagawa Prefecture in Japan.

The dam is used for power production.

The dam impounds about 2 ha of land when full and can store 90 thousand cubic meters of water.

The construction of the dam was started on 1914 and completed in 1917.

This article about a dam or floodgate in Kantō region of Honshu, Japan is a stub.