The O'Shaughnessy Dam is located on the Scioto River near Dublin, Ohio, United States.

The dam forms O'Shaughnessy Reservoir, which is a major source of drinking water for the city of Columbus.

Located 10 miles (16 km) upstream of the smaller Griggs Dam, it provides a large area for various forms of recreation in addition to its water supply duties.

[5][7] Despite numerous repair attempts the Hydroelectric Turbines have remained offline for approximately three years (ostensibly as of August 2018).

In January, 2021, The City of Columbus announced plans to repair the hydropower unit and restore the plant to full capacity by 2023.