Map of the Catoctin Creek drainage basin, urban areas are in red.
Catoctin Creek is a 27.9-mile-long (44.9 km) tributary of the Potomac River in Frederick County, Maryland, USA. Its source is formed in the Myersville, Maryland area and flows directly south for the entire length of the stream. Catoctin Creek enters the Potomac River east of Brunswick. The stream flows through Catoctin Creek Park.
Coordinates: 39°18′29″N 77°33′57″W / 39.308157°N 77.565822°W