| Catoctin Creek | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Virginia |
| Subdivision Type3: | Region |
| Subdivision Name3: | Loudoun County |
| Length: | 14miles |
| Source1 Location: | Waterford |
| Source1 Coordinates: | 39.2098°N -77.6211°W |
| Mouth: | Potomac River |
| Mouth Location: | Point of Rocks, Maryland |
| Mouth Coordinates: | 39.2757°N -77.5511°W |
| Mouth Elevation: | 217feet |
| River System: | Potomac River |
| Basin Size: | 92.54sqmi |
| Tributaries Left: | South Fork Catoctin Creek |
| Tributaries Right: | North Fork Catoctin Creek |
Catoctin Creek is a 14.1adj=midNaNadj=mid[1] tributary of the Potomac River in Loudoun County, Virginia, with a watershed of 59000acres. Agricultural lands make up 67 percent and forests 30 percent of Catoctin Creek's watershed. It is the main drainage system for the northern Loudoun Valley, including all of the Catoctin Valley.
The main arteries consist of the Catoctin and its North and South Forks.
The North Fork Catoctin Creek, long,[1] begins at Purcellville Reservoir east of the Blue Ridge Mountains in the Between the Hills valley, near the West Virginia border. State Route 9 follows the north fork westward as it flows through Hillsboro Gap in Short Hill Mountain at Hillsboro. From Wheatland the North Fork flows northeast.
The source of the 18.5adj=midNaNadj=mid[1] South Fork Catoctin Creek is just east of the Blue Ridge's Wilson Gap on the West Virginia border. From the source the South Fork flows southeast toward Purcellville, where it turns north and east toward Waterford, where it flows north again to its confluence with the North Fork.
The main branch of Catoctin Creek is formed by the confluence of its forks along the western edges of Catoctin Mountain north of Waterford and southeast of Milltown. The creek flows north along Catoctin Mountain's western side through the village of Taylorstown. Catoctin Creek continues meandering along the northern edge of Furnace Mountain and empties into the Potomac River to the north of the U.S. Highway 15 bridge across from Point of Rocks, Maryland.