Namgoru () is a Goryeo-era embankment now located in Gyeongju, South Korea. On January 21, 1963, it was made Historic Site of South Korea No. 17.
It is not known with certainty when the embankment was built. The construction of such an embankment in this general area in 1012 (Korean calendar) is mentioned in the history text "Koryŏsa", but it is uncertain if this is the structure in question. Its purpose is also unknown; it was possibly for flood control or for military purposes.