| Province: | NL |
| Type: | NL |
| Route: | 73 |
| Alternate Name: | New Harbour Road Back Track Road |
| Maint: | Newfoundland and Labrador Department of Transportation and Infrastructure |
| Length Km: | 19.2 |
| Direction A: | West |
| Terminus A: | in New Harbour |
| Junction: | in Tilton |
| Direction B: | East |
| Terminus B: | in Tilton |
| Previous Type: | NL |
| Previous Route: | 72 |
| Next Type: | NL |
| Next Route: | 74 |
Route 73 is a 19.2adj=midNaNadj=mid east–west highway on the Avalon Peninsula of Newfoundland. It connects the towns of New Harbour and Spaniard's Bay via Tilton and Route 70. The majority of Route 73 is known as New Harbour Road, except within the town limits of Spaniard's Bay, where it is known as Back Track Road.
Route 73 begins at an intersection with Route 80 (Trinity Road) in the easternmost part of New Harbour. It heads east through rural wooded terrain for several miles to enter the Spaniard's Bay town limits, and Tilton, to have an interchange with Route 75 (Veterans Memorial Highway). The highway passes through neighbourhoods before coming to an end at an intersection with Route 70 (Conception Bay Highway).