District School No. 3, also known as Rock Creek Township School No. 3, Election School, and Martin School, is a historic school building located in Rockfield, Indiana in Rock Creek Township, Carroll County, Indiana. It was built in 1874, and is a one-story, rectangular red brick building with Greek Revival and Italianate style design elements. It has a front gable roof and sits on a fieldstone foundation.
It was listed on the National Register of Historic Places in 1988.