Route 18, also known as Cape Bear Road, is a 23.9 kilometres (14.9 mi), two-lane, uncontrolled-access, secondary highway in eastern Prince Edward Island.

Its southern terminus is at Route 4 in High Bank and its northern terminus is at Route 4 in Murray River.

The route begins at its southern terminus and goes west to Guernsey Cove, where it turns right and continues northwest.

The route turns left and then curves left in Beach Point to head southwest to a right turn in Murray Harbour.

It is 2.9 kilometres (1.8 mi) long and runs between Guernsey Cove and Murray Harbour.