| Type: | cadastral |
| Nandewar | |
| State: | nsw |
| Near-Nw: | Jamison |
| Near-N: | Courallie |
| Near-Ne: | Murchison |
| Near-E: | Darling |
| Near-Se: | Parry |
| Near-S: | Buckland |
| Near-Sw: | Pottinger |
| Near-W: | White |
Nandewar County is one of the 141 cadastral divisions of New South Wales. It is located to the east of the Namoi River, with Narrabri at the north-west edge, and Gunnedah at the southern edge.
Nandewar County is named after the range of mountains called Nandewar by the local Aboriginals.
A full list of parishes found within this county; their current LGA and mapping coordinates to the approximate centre of each location is as follows: