Osa Dam (Japanese: 大佐ダム) is a dam in the Okayama Prefecture, Japan, completed in 1981.

It is managed by the prefecture's Ministry of Agriculture, Forestry and Fisheries.

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

You can help Wikipedia by expanding it.This Okayama Prefecture location article is a stub.

You can help Wikipedia by expanding it.