| Big Sandy Creek | |
| Source1 Coordinates: | 48.1589°N -109.6967°W |
| Mouth Coordinates: | 48.5681°N -109.8017°W |
| Mouth Coord Ref: | [1] |
| Subdivision Type1: | Country |
| Subdivision Name1: | Hill and Chouteau County, Montana |
| Mouth Elevation: | 2484feet |
| River System: | Missouri River |
Big Sandy Creek (báasnɔ́ɔ́ɔ́béʔ|lit=big sand[2]) is a tributary of the Milk River, approximately 50 miles (80 kilometers) long, in northwestern Montana in the United States.
It rises in the southern Rocky Boys Indian Reservation in the Bears Paw Mountains and flows southwest, then north past Box Elder, then northeast, joined by Sage Creek, and joins the Milk approximately 10 mi (16 km) west of Havre.
Big Sandy Creek has also been known as: Ahmi-Saptsiko, Sand Creek, and Un-es-putcha-eka.[1]