Nakaozawa-zeki is an earthfill dam located in Chiba Prefecture in Japan.

The catchment area of the dam is 0.9 km2.

The dam impounds about 3 ha of land when full and can store 137 thousand cubic meters of water.

The construction of the dam was started on 1934 and completed in 1938.

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