Lewistown Armory

Lewistown Armory is a historic National Guard armory located at Derry Township, Mifflin County, Pennsylvania. It was built in 1938, and is a one-story, "I"-plan brick building with an exposed basement executed in the Colonial Revival style. It consists of a front administrative section with a drill hall and former stable area behind. The front and stable buildings have hipped roofs, while the drill hall has a gable roof. The drill hall measures 60 feet by 90 feet.

It was added to the National Register of Historic Places in 1991.