The Kunming–Yuxi–Hekou railway is a standard-gauge railway in Yunnan Province of China, linking the provincial capital Kunming with the town of Hekou on the Vietnamese border. Constructed in several stages between 1989 and 2014, the Kunming–Yuxi–Hekou railway has largely replaced the Chinese section of the old metre-gauge Kunming–Haiphong railway for normal passenger and cargo transportation. The line is electrified, but single-tracked over most of its length.

The Hekou Yao Autonomous County is an autonomous county in the southern part of the Yunnan province of China. It is part of the Honghe Hani and Yi Autonomous Prefecture and borders the northern Vietnamese city of Lào Cai.