Hawlings River is a 12.9-mile-long (20.8 km) tributary of the Patuxent River in Montgomery County, Maryland. The watershed covers an area of about 28 square miles (73 km²). The headwaters of the river originate in the area north of Laytonsville, and the river flows southeast, entering the Patuxent about 1.5 miles (2.4 km) below the Triadelphia Reservoir. Portions of Hawlings River flow through Rachel Carson Conservation Park and Hawlings River Stream Valley Park. Tributaries of the Hawlings River include Mount Zion Tributary, Reddy Branch, Olney Mill Tributary, Gregg Tributary, and James Creek.