Shimohara Dam (下原ダム, Shimohara damu) is a dam in the city of Gero, Gifu Prefecture, Japan on the middle reaches of the Hida River, which is part of the Kiso River system.

The dam was constructed exclusively for hydroelectric power generation and generates a maximum of 22,000 kilowatts at the Shimohara Power Station downstream of the dam.

The dam was completed in 1938 by the Toho Electric Power Company as part of the pre-war Hida River Development Project and was taken over by the Chubu Electric Power Company from 1951.

The dam is located with the borders of the Hida-Kisogawa Quasi-National Park.

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