| Country: | ZAF |
| Type: | R |
| Route: | 603 |
| Length Km: | 84 |
| Direction A: | North-west |
| Terminus A: | at Umlaas Road near Camperdown |
| Junction: | near Hammarsdale in Kingsburgh |
| Direction B: | South-east |
| Terminus B: | in Kingsburgh |
| Towns: | Kingsburgh, Umbumbulu |
| Previous Type: | R |
| Previous Route: | 602 |
| Next Type: | R |
| Next Route: | 612 |
The R603 is a Regional Route in KwaZulu-Natal, South Africa connecting Kingsburgh on the South Coast with Umlaas Road, between Pietermaritzburg and Durban, via Umbumbulu.[1]
Its north-western terminus is the N3 in Umlaas Road near Camperdown, KwaZulu-Natal. It initially heads south, crossing the R103. It then passes just west of Hammarsdale and, after 15 kilometres, it intersects with the R624's eastern terminus, and heads south-east. It proceeds to meet the western terminus of the M30 at Umbumbulu. It proceeds south-east to Kingsburgh on the South Coast, where it crosses the N2 highway and ends just after at a junction with the R102.