| Green River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | North Dakota |
| Source1 Coordinates: | 47.15°N -103.2772°W |
| Source1 Elevation: | 2763feet |
| Mouth: | Heart River |
| Mouth Coordinates: | 46.8619°N -102.5858°W |
| Mouth Elevation: | 2293feet |
The Green River is a tributary of the Heart River, approximately 20 mi (32 km) long, in western North Dakota in the United States.
It rises in the prairie country of southwestern Billings County, near Saddle Buttes, and flows ESE past New Hradec, and joins the Heart near Gladstone.