| Province: | PE |
| Type: | PE |
| Route: | 4 |
| Image Notes: | Route 4 near Cardigan |
| Maint: | Transportation and Public Works |
| Length Km: | 64.9 |
| Length Ref: | [1] |
| Direction A: | South |
| Direction B: | North |
| Terminus A: | at Wood Islands |
| Junction: | in Murray River at Murray River and Montague near Montague near Cardigan |
| Terminus B: | at Dingwells Mills |
| Counties: | Kings, Queens |
| Previous Type: | PE |
| Previous Route: | 3 |
| Next Type: | PE |
| Next Route: | 5 |
Route 4 is a 63km (39miles) long, two-lane uncontrolled access secondary highway in eastern Prince Edward Island, Canada. In runs east from the Trans-Canada Highway (Route 1) at Wood Islands along the Northumberland Straight to Route 18 the settlement of High Bank, where it turns north and passes through Murray River and Montague before ending at Route 2 at Dingwells Mills.[2] Its maximum speed limit is .[3]
Route 4 is designated an arterial highway for approximately from Route 2 in Dingwells Mills to Route 17 in Montague; the remainder is designated a collector highway.[4]
Route 4 has several local names:[2]
From south to north:[2]