Nasir County
| Nasir County KuanyLualThuan | |
|---|---|
| County | |
| Coordinates: 8°36′N 33°4′E / 8.600°N 33.067°E | |
| Country | South Sudan | 
| Region | Greater Upper Nile | 
| State | Upper Nile State | 
| Headquarter | Nasir, South Sudan | 
| Government | |
| • Commissioner | James Gatluak Lew Thiep | 
| Area | |
|  • Total | 2,003 sq mi (5,188 km2) | 
| Population  (2017 estimate) | |
|  • Total | 302,034+ | 
| Time zone | UTC+2 (CAT) | 
Nasir County also known as KuanyLualThuan is an administrative area of Upper Nile State in the Greater Upper Nile region of South Sudan. The headquarters is the town of Nasir, on the north side of the Sobat River, about 30 kilometres (19 mi) from the Ethiopian border.