Route 73 is a 19.2-kilometre-long (11.9 mi) 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.

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).