| Soldier River | |
| Map: | Lewis clark Boyer soldier littlesioux floyd.jpg |
| Subdivision Type1: | Country |
| Subdivision Name1: | US |
| Subdivision Type2: | State |
| Subdivision Name2: | Iowa |
| Subdivision Type4: | District |
| Subdivision Name4: | Harrison County, Iowa |
| Discharge1 Location: | Pisgah, Iowa |
| Discharge1 Avg: | 174 cu/ft. per sec.[1] |
| Source1 Coordinates: | 42.2697°N -95.3297°W |
| Mouth: | Missouri River |
| Mouth Coordinates: | 41.7375°N -96.0978°W |
| Mouth Elevation: | 1010feet |
The Soldier River is a tributary of the Missouri River, about long,[2] in western Iowa in the United States. Several portions of the river's course have been straightened and channelized.
The Soldier River rises in southeastern Ida County and flows generally southwestwardly through northwestern Crawford, southeastern Monona and northwestern Harrison Counties, past the towns of Ute, Soldier, Moorhead and Pisgah. It flows into the Missouri River via a diversion channel about 5 mi (8 km) west-northwest of Mondamin.
At Ute, the river collects the East Soldier River, which rises near Schleswig and flows past Charter Oak. The East Soldier River collects the Middle Soldier River, which flows past Ricketts.