| Muddy Branch | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Maryland |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Montgomery |
| Source1 Location: | Gaithersburg, MD |
| Mouth: | Potomac River |
| Mouth Location: | North of Pennyfield Lock, Potomac, MD |
| Mouth Coordinates: | 39.0544°N -77.2936°W |
Muddy Branch is a tributary stream of the Potomac River in Montgomery County, Maryland, United States, located about 14miles northwest of Washington, D.C.
The headwaters of the stream originate in Gaithersburg, and the stream flows southwest for,[1] through Muddy Branch Park and Blockhouse Point Conservation Park, under the Chesapeake and Ohio Canal near Pennyfield Lock, to the Potomac River.
Parts of Muddy Branch flow through Blockhouse Point Conservation Park and the Muddy Branch Stream Valley Park. The Muddy Branch Greenway Trail is a long natural surface trail that runs from the Potomac River to Darnestown Road.[2] along Muddy Branch. There is a boat ramp on Muddy Branch just before it goes under the C & O canal that can be used by small boats (such as canoes and kayaks) to access the Potomac River.[3]