An inbred corn line, designated MDS9820, is disclosed. The disclosure relates to the seeds of inbred corn line MDS9820, to the plants of inbred corn line MDS9820 and to methods for producing a corn plant, either inbred or hybrid, by crossing the inbred line MDS9820 with itself or with another corn line. The disclosure further relates to methods for producing other inbred corn lines derived from the inbred MDS9820.
