Sanbon-dong[a] is a dong, or neighborhood, in Gunpo, a satellite city of Seoul in Gyeonggi Province, South Korea.

Its name can be translated as "the mountain's root," and refers to its position at the base of Surisan's eastern flank.

The administrative entity of Sanbon was formed in 1914, as part of a general nationwide consolidation of local government under the Japanese occupation.

The name is believed to derive from Sanjeo, "low on the mountain," which was first used to describe the region in 1789.

Other landmarks include various Joseon Dynasty relics: a large kiln site, a shrine of the royal Jeonju Yi clan, and the tomb of 17th-century scholar Hoam Yi Gi-jo.