Mazegawa No.2 Dam (馬瀬川第二ダム, Mazegawa dai-ni da-mu) is a dam in the city of Gero in Gifu Prefecture, Japan on the Maze River.

The dam is part of the Iwaya Dam project which acts as a flood control across the wider Kiso River system.

[1] The dam is a concrete gravity dam with a height of 44.5 meters.

It is managed by the Chubu Electric Power Company.

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