The Broadkill River is a river flowing to Delaware Bay in southern Delaware in the United States. It is 13.3 miles (21.4 km) long and drains an area of 110 square miles (280 km2) on the Atlantic Coastal Plain. In the 19th century the river was the center of a regional shipbuilding industry, arising from the access it furnished to inland forests; the industry fell into decline in the 1890s.