Line 4 of the Guangzhou Metro is a south-north line on the system that runs between Nansha Passenger Port and Huangcun stations, spanning a total of 60.03 km (37.30 mi) with 24 stations. The sections of the line from Xinzao to Huangcun, Feishajiao to Nansha Passenger Port is underground, while that Jinzhou to Guanqiao is above ground. Line 4's colour is dark green. Like line 5 and 6, trains runs with linear motor technology.

The Guangzhou Metro is the rapid transit system of the city of Guangzhou in the Guangdong Province of China. It is operated by the state-owned Guangzhou Metro Corporation and was the fourth metro system to be built in mainland China, after those of Beijing, Tianjin, and Shanghai.