Gwynns Falls is a 24.9-mile-long (40.1 km) stream located in Baltimore County and Baltimore City, Maryland. The headwaters are located in Reisterstown in Baltimore County, and the stream flows southeast, entering the city of Baltimore and emptying into the Middle Branch of the Patapsco River. The Patapsco drains into the Chesapeake Bay. The watershed area of Gwynns Falls is 66 square miles (170 km2).
The stream was named for Richard Gwinn, who opened a trading post along it in 1669. Gwynns Falls does not actually have a waterfall, but its rough, rocky nature caused John Smith to comment on how the stream tumbled over "felles". This confusing local practice of using "falls" in the name of rocky streams was also applied to Baltimore's Jones Falls and Gunpowder Falls, which do not have waterfalls.
During periods of high water conditions the stream can be whitewater kayaked with the most challenging section running from the dam in Dickeyville to the Washington Street bridge crossing. This section is entirely within the city limits of Baltimore. One unusual feature of the run has a city water pipe main about one foot above the water level that normally requires a portage around it.
See also 
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed April 1, 2011
- Baltimore County Department of Environmental Protection and Resource Management (DEPRM). Towson, MD. "Gwynns Falls Watershed." Accessed 2009-12-29.
- DEPRM and Baltimore City Department of Public Works (October 2004)." Gwynns Falls Water Quality Management Plan: Executive Summary."
- United States Geological Survey. Reston, VA. Feature Detail Report for: Gwynns Falls. USGS Geographic Names Information System. Retrieved 2009-12-29.
- Evan Balkan (2006). 60 Hikes within 60 Miles. "Gwynns Falls Park," p. 50. Menasha Ridge Press. ISBN 13:9780897326230.
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