Dandong (simplified Chinese: 丹东; traditional Chinese: 丹東; pinyin: Dāndōng), previously known as Andong and Antung, is a city in Liaoning Province, Northeast China. It lies on the border between China and North Korea, which is marked by the Yalu River, and is the largest border city in China. Also, to the southwest of the city, the river flows into Korea Bay. The city has therefore had a dynamic history because of its strategic location for the northeast's rich natural resources and because of its convenient access to the ocean.

Dandong is designated a major export production center in Liaoning province. Dandong is a port city connected by rail with Shenyang and Sinuiju in North Korea.

The Hushan (Tiger Mountain) Great Wall, the far Eastern end of the Great Wall of China, is located here.

The size of the administrative city (prefecture) is 14,981.4 square kilometres (5,784.4 sq mi); as of 2005, the urban area is 563 square kilometres (217 sq mi) in size and has 780,414 inhabitants. The administrative city covers around 2.4 million inhabitants as of 2009.