Ohtsu Dam is a gravity dam located in Gunma Prefecture in Japan.

The dam is used for power production.

The dam impounds about 4 ha of land when full and can store 108 thousand cubic meters of water.

The construction of the dam was started on 1928 and completed in 1931.

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