Line 13 of the Beijing Subway is a metro line that serves the northern suburbs of Beijing. On a map, Line 13's route is shaped like an inverted U that arcs north of the city and connects residential suburbs in Haidian, Changping, and Chaoyang Districts with the 2nd Ring Road and Line 2 at Xizhimen and Dongzhimen. With the exception of Dongzhimen and a tunnel between Xi'erqi and Longze, all of Line 13's tracks and stations are located on the surface or elevated above ground. The line is 40.85 km (25.38 mi) and 16 of its 17 stations are on the surface. Line 13's color is yellow. During rush hour, the section between Xizhimen and Wudaokou Stations was reported in 2013 to be the second most congested section in the Beijing subway network, operating at 130% capacity.

Haidian District is an urban district of the city of Beijing. It is mostly situated in northwestern Beijing, but also to a lesser extent in the west, where it has borders with Xicheng and Fengtai.