The Mandŏk Line is an electrified standard-gauge secondary line of the Korean State Railway in Hŏch'ŏn County, South Hamgyŏng Province, North Korea running from Hŏch'ŏn on the Hŏch'ŏn Line to Mandŏk.

[1] This line was opened by the privately owned Tanp'ung Railway as a branch of its Tanchon−Honggun mainline opened on 26 August 1939.

[2] A pair of local passenger trains 931/932 are known to operate on this line between Hŏch'ŏn and Mandŏk.

[1] A yellow background in the "Distance" box indicates that section of the line is not electrified.