| Diep River | |
| Name Etymology: | Afrikaans for deep |
| Map: | Rivers of Cape Region RSA OSM.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | South Africa |
| Subdivision Type3: | Region |
| Subdivision Name3: | Western Cape Province |
Diep River (Afrikaans Dieprivier), drains the area between the Kasteel Mountain (north of Malmesbury) and the northern slopes of the Durbanville Hills, in the Western Cape, a province of South Africa.