| Alder Creek | |
| Map Size: | 250 |
| Pushpin Map: | USA California |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Location of Alder Creek in California |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | California |
| Length: | 4.25miles |
| Source1: | San Gabriel Mountains |
| Source1 Location: | Angeles National Forest |
| Source1 Coordinates: | 34.3517°N -118.05°W[1] |
| Source1 Elevation: | 4382feet |
| Mouth: | Big Tujunga Creek |
| Mouth Coordinates: | 34.3075°N -118.0744°W |
| Mouth Elevation: | 3396feet |
Alder Creek is an approximately 4.25miles long[1] tributary of Big Tujunga Creek in Los Angeles County, California and the Angeles National Forest. It is formed by the confluence of the West Fork and North Fork Alder Creek in the San Gabriel Mountains a short distance south of Pacifico Mountain. It then flows south, picking up the Middle Fork, East Fork and Mule Fork before emptying into Big Tujunga Creek 5miles east of Hidden Springs. Near its mouth the creek flows under a bridge carrying Upper Big Tujunga Canyon Road.