Komukai Dam is a gravity dam located in Chiba Prefecture in Japan.

The catchment area of the dam is 11.3 km2.

The dam impounds about 10 ha of land when full and can store 950 thousand cubic meters of water.

The construction of the dam was started on 1972 and completed in 1975.

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