| Casto Creek | |
| Pushpin Map: | Missouri |
| Pushpin Map Caption: | Location of the mouth within Missouri |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Missouri |
| Subdivision Type3: | Region |
| Subdivision Name3: | Douglas County |
| Source1 Coordinates: | 37.0539°N -92.6617°W |
| Source1 Elevation: | Approximately 1470feet[1] |
| Mouth Coordinates: | 36.9872°N -92.7031°W. |
| Mouth Elevation: | 1109feet |
Casto Creek is a stream in northwest Douglas County, Missouri. The headwaters of Casto Creek are north of Ava within one half mile of the Douglas - Wright county line. The stream flows south roughly paralleling Missouri Route B then turns to the southwest west of the community of Mount Zion. The stream continues to the southwest meeting its confluence with Cowskin Creek just north of Missouri Route 14 about three miles west of Ava.[2]
Casto Creek has the name of the local Casto family which settled near it.[3]