Wallace-Cross Mill is a historic grist mill located at East Hopewell Township, York County, Pennsylvania. It was built in 1826, and is a 2 1/2-story, frame building on a stone foundation. It has a gable roof with decorative bargeboard. It has an 11 feet in diameter, 4 feet wide, steel water wheel to run the machinery. The mill was given to York County by its owner in 1979.It was added to the National Register of Historic Places in 1977.