Wonsan, previously known as Wonsanjin (元山津), is a port city and naval base located in Kangwon Province, North Korea, along the eastern side of the Korean Peninsula, on the Sea of Japan and the provincial capital. The port was opened by occupying Japanese forces in 1880. Before 1950–1953 Korean War, it fell within the jurisdiction of the then South Hamgyong province, and during the war, it was the location of the Blockade of Wonsan. The population of the city was estimated at 329,207 in 2013. Notable people from Wonsan include Kim Ki-nam, a diplomat and former Vice Chairman of the ruling Workers' Party of Korea.

Kangwon Province is a province of North Korea, with its capital at Wŏnsan. Before the division of Korea in 1945, Kangwŏn Province and its South Korean neighbour Gangwon Province formed a single province that excluded Wŏnsan.