Friendship Pass (Chinese:???;formerly ???; Vietnamese: H?u Ngh? Quan; formerly and most commonly known as ?i Nam Quan (both the present Vietnamese and Chinese names mean Friendship Pass) is a pass near the border between the China's Guangxi and Vietnam's Lang Son Province. This is one of the busiest border trading points of Vietnam.

During the Ming dynasty the pass was known as Zhennanguan (??? - South Suppressing Pass). In 1953; its name was changed to Munanguan (??? - South Watching Pass). In 1965; it became known as Youyiguan (??? - Friendship Pass) as communist China and communist North Vietnam had closer political; military and economic ties.