| Province: | NB |
| Type: | NB |
| Route: | 303 |
| Maint: | New Brunswick Department of Transportation |
| Length Km: | 7 |
| Length Ref: | [1] [2] |
| Length Round: | 1 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | in Dugas |
| Counties: | Gloucester |
| Terminus B: | in Maisonnette |
| Previous Type: | NB |
| Previous Route: | 280 |
| Next Type: | NB |
| Next Route: | 305 |
Route 303 is a short provincial route in New Brunswick, Canada that runs from Route 11 near Dugas to an intersection with Route 320 in Maisonnette.