The Shanghai Outer Ring Expressway (Chinese: 上海外环高速公路), designated S20, is a ring expressway that surrounds the inner districts of the city of Shanghai, China.

The different sections of the road formerly had specific names in relation to the cardinal directions.

For instance, the eastern portion of the expressway was named 上海环东一大道 (Huandong Avenue (No.

The S20 expressway crosses the Huangpu River twice.

This People's Republic of China road-related article is a stub.