Munsan-myeon is a myeon (township) in the northern part of Seocheon-gun, Chungcheongnam-do, South Korea. It is bordered by Masan-myeon to the east, Buyeo-gun's Oksan-myeon to the north, Pangyeon-myeon to the west, and Seocheon-eup's Sicho-myeon to the south. As of 2006 it had a population of 1,590.