The Lehigh River, a tributary of the Delaware River, is a 109-mile-long (175 km) river located in eastern Pennsylvania, in the United States. Part of the Lehigh, along with a number of its tributaries, is designated a Pennsylvania Scenic River by the state’s Department of Conservation and Natural Resources. “Lehigh” is an Anglicization of the Lenape name for the river, Lechewuekink, meaning “where there are forks”.

The river flows in a highly winding course through valleys between ridges of the Appalachian Mountains. Its upper course is characterized by numerous whitewater rapids and supports a broad range of recreational pursuits including whitewater rafting, kayaking and canoeing. Its lower course forms the heart of the Lehigh Valley, a historically important anthracite coal and steel-producing region of Pennsylvania.