| Madeirinha River | |
|---|---|
  | |
| Native name | Rio Madeirinha (Portuguese) |
| Location | |
| Country | Brazil |
| Physical characteristics | |
| Source | |
| • location | Mato Grosso state |
| Mouth | |
• location | Roosevelt River, Amazonas state |
• coordinates | 8°31′07″S 60°57′29″W / 8.518710°S 60.958048°W |
| Basin features | |
| River system | Roosevelt River |
Madeirinha River is a river of Mato Grosso and Amazonas states in north-western Brazil, a left tributary of the Roosevelt River.