Muddy Branch is a tributary stream of the Potomac River in Montgomery County, Maryland, United States, located about 14 miles (23 km) northwest of Washington, D.C.

The headwaters of the stream originate in Gaithersburg, and the stream flows southwest for 11.9 miles (19.2 km),[1] through Muddy Branch Park and Blockhouse Point Conservation Park, under the Chesapeake and Ohio Canal near Pennyfield Lock, to the Potomac River.

The Muddy Branch Greenway Trail is a 12 miles (19 km) long natural surface trail that follows the stream from the Potomac River to Malcolm King Park in Gaithersburg, Maryland.

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