| Official Name: | Riachinho |
| Settlement Type: | Municipality |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location in Brazil |
| Coordinates: | -6.4378°N -48.1369°W |
| Subdivision Type: | Country |
| Subdivision Name: | Brazil |
| Subdivision Type1: | Region |
| Subdivision Name1: | North |
| Subdivision Type2: | State |
| Subdivision Name2: | Tocantins |
| Subdivision Type3: | Mesoregion |
| Subdivision Type4: | Microregion |
| Subdivision Type5: | Metrop. region |
| Leader Title: | Mayor |
| Population Total: | 4,684 |
| Population As Of: | 2020 [1] |
| Population Density Km2: | auto |
| Timezone1: | BRT |
| Utc Offset1: | -3 |
| Postal Code Type: | Postal code |
| Area Code Type: | Area code |
Riachinho is a municipality in the state of Tocantins in the Northern region of Brazil.[2]
The municipality contains 3.43% of the Lago de Santa Isabel Environmental Protection Area, created in 2002.