| Army Creek | |
| Name Other: | Armstrong Creek Mill Creek[1] |
| Map Size: | 180 |
| Map Alt: | Map of Army Creek mouth |
| Pushpin Map: | Delaware#USA |
| Pushpin Map Size: | 180 |
| Pushpin Map Alt: | Location of Army Creek mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | County |
| Subdivision Name3: | New Castle |
| Length: | 4miles[2] |
| Source1: | watershed divide between Army Creek and Christina River |
| Source1 Location: | near Buena Vista State Conference Center |
| Source1 Coordinates: | 39.6344°N -75.6428°W |
| Source1 Elevation: | about 60 feet |
| Mouth Location: | 1 mile SW of New Castle, Delaware |
| Mouth Coordinates: | 39.6514°N -75.5872°W |
| Mouth Elevation: | sea level (0 ft.) |
| Progression: | East-Northeast |
| River System: | Delaware River |
| Tributaries Left: | several unnamed tributaries |
| Tributaries Right: | several unnamed tributaries |
| Waterbodies: | one unnamed impoundment |
| Bridges: | US 13 DE 9 |
Army Creek is a 4miles long river in northern Delaware in the United States that drains about 10mi2.[3] The stream is controlled by a floodgate just downstream of DE 9 that does not allow tidal influence of the stream.
The source of Army Creek is near the eastern edge of Bear, Delaware in the south and New Castle County Airport in the north. The water then flows ENE to the Delaware River about 1miles SW of New Castle, Delaware, at Dobbinsville. Most of the watershed is urban/residential.
The watershed is the scene of two Superfund sites owing to the urban/industrial history.