| Province: | NL |
| Type: | NL |
| Route: | 403 |
| Maint: | Newfoundland and Labrador Department of Transportation and Infrastructure |
| Length Km: | 21.3 |
| Direction B: | North |
| Terminus B: | near St. George's |
| Direction A: | South |
| Terminus A: | Dead End in Journois |
| Previous Type: | NL |
| Previous Route: | 402 |
| Next Type: | NL |
| Next Route: | 404 |
Route 403 is a minor highway in the western region of Newfoundland in the Canadian province of Newfoundland and Labrador. The highway begins at a junction with the Trans-Canada Highway (Route 1) and continues to its northern terminus, the community of Journois.
Route 403 begins at an intersection with Route 1 (Trans-Canada Highway) along the banks of Flat Bay Brook. It heads west paralleling the brook to pass through Joyce, where it makes a sharp right turn to the north to enter Flat Bay, where it makes a left turn as it passes through town. The highway now heads southwest along the coastline to pass through Flat Bay West and St. Teresa before coming to a dead end in Journois.