| Willoughby Run | |
|---|---|
 | |
| Location | |
| Country | United States |
| State | Pennsylvania |
| Region | Adams County |
| Township | Cumberland |
Willoughby Run is a tributary of Marsh Creek in Adams County, Pennsylvania in the United States.[1]
Willoughby Run flows southward between Herr Ridge and McPherson Ridge through the Gettysburg Battlefield.