| Little Wood River | |
| Name Other: | McArthurs River & Wood River |
| Pushpin Map: | Idaho#USA |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the Little Wood River in Idaho |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Idaho |
| Subdivision Type3: | Region |
| Subdivision Name3: | Blaine County, Lincoln County, Gooding County |
| Length: | 130miles |
| Discharge1 Location: | below Little Wood Reservoir[1] |
| Discharge1 Min: | 0.34cuft/s |
| Discharge1 Avg: | 351cuft/s[2] |
| Discharge1 Max: | 2900cuft/s |
| Source1: | Pioneer Mountains |
| Source1 Location: | Blaine County |
| Source1 Coordinates: | 43.7614°N -114.0036°W |
| Source1 Elevation: | 9832feet[3] |
| Mouth: | Malad River |
| Mouth Location: | Gooding County |
| Mouth Coordinates: | 42.945°N -114.7961°W |
| Mouth Elevation: | 3460feet |
Little Wood River is a 130adj=midNaNadj=mid[4] river in south-central Idaho in the United States. It is a tributary of the Malad River, which in turn is a tributary to the Snake River and Columbia River.
The Little Wood River originates in the Pioneer Mountains of northern Blaine County, then flows south through Little Wood Reservoir near Carey. Below the reservoir the river flows south into Lincoln County, past Richfield, and then west, past Shoshone, after which it enters Gooding County. Just west of Gooding, the Little Wood River joins the Big Wood River to form the Malad River.
Its tributaries include Baugh Creek.
The Little Wood River is the key source of irrigation water for eastern Blaine County and most of Lincoln County. Its water was a major attraction for the region's first permanent settlement at Carey. The river's water flow is regulated by reservoirs and affected by diversions of water into irrigation canals.
Variant names of the Little Wood River, according to the USGS, include McArthurs River and Wood River.