Linganore Creek is a 13.5-mile-long (21.7 km)[1] tributary of the Monocacy River in Frederick County, Maryland.

The stream is formed from the confluence of the north and south forks of the Linganore (39°26′56″N 77°13′18″W / 39.4489911°N 77.2216489°W / 39.4489911; -77.2216489), about 10 miles (16 km) east-northeast of the city of Frederick.

[2] The name "linganore" purportedly means "left ear" (of the Potomac), a name coined by an American Indian chief who once lived on the banks of the waterway.

[3][4] Lake Linganore, an impoundment built on the creek about 4 miles (6 km) east of Frederick, is the principal source of drinking water for the city.

It is also a drinking water source for the central portion of Frederick County.