| State: | NH |
| Type: | NH |
| Route: | 126 |
| Map Custom: | yes |
| Map Notes: | Map of eastern New Hampshire with NH 126 highlighted in red |
| Length Mi: | 15.265 |
| Direction A: | South |
| Terminus A: | in Barrington |
| Junction: | in Barrington |
| Direction B: | North |
| Terminus B: | in Barnstead |
| Counties: | Strafford, Belknap |
| Previous Type: | NH |
| Previous Route: | 125 |
| Next Type: | NH |
| Next Route: | 127 |
New Hampshire Route 126 (abbreviated NH 126) is a 15.265adj=midNaNadj=mid north–south state highway in eastern New Hampshire. It runs between the towns of Barrington and Barnstead.
The southern terminus of NH 126 is in Barrington at New Hampshire Route 9, where NH 126 is named Barnstead Road. The northern terminus is in the town of Barnstead at New Hampshire Route 28.