Duncan Church

Duncan Church, also known as Saint Placidus Catholic Church, is a historic church near Gann Valley, South Dakota. It is located southwest of Crow Creek, about 2 mi south of the county line. It is about 13 mi north and west of Gann Valley. It was built in 1927 and was added to the National Register in 1999.

It is a basilica plan church about 28x42 ft in size. It has clapboard siding and a gable roof.