Munsan-myeon (문산면, 文山面) 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.
Munsan-myeon was created in 1914 by the merger of Munjang-myeon (문장면, 文章面) and Dusan-myeon (두산면, 豆山面) in part of a wider reorganisation of Korea's administrative districts.
It took taking one character from each of its parts to come up with the new name.
Administratively subordinate to Munsan-myeon are eighteen ri (villages).