Line 21 of the Guangzhou Metro is a rapid transit rail line in Guangzhou.

Line 7 of the Guangzhou Metro is a rapid transit line in Guangzhou and Foshan, Guangdong Province, China. It is envisioned as tangential line that runs across southeast Guangzhou and Foshan, allowing for orbital traffic between the suburbs of Shunde, Panyu and Huangpu to avoid the crowded stations in the city center. Line 7's color is ■ light green.