Line 11 is a northwest–southeast line of the Shanghai Metro network. Since October 2013, Line 11 serves Kunshan city, making it is the second intercity metro in China after the Guangfo Metro and the first that crosses a provincial boundary. With a single-line mileage of 82.386 kilometres (51.192 mi), it is the second-longest single-line subway line in China, after Line 6 in Chongqing, which is 85.6 km (53.2 mi) long. The line is colored brown on system maps.

The Shanghai Metro (Chinese: 上海地铁; pinyin: Shànghǎi Dìtiě; Shanghainese: Zaon6he5 Di6thiq7) is a rapid transit system in Shanghai, operating urban and suburban transit services to 14 of its 16 municipal districts and to the neighboring township of Huaqiao, in Kunshan, Jiangsu Province.