| Klaas Smits River | |
| Name Other: | Klaas Smitsrivier |
| Pushpin Map: | South Africa |
| Pushpin Map Caption: | Location of the Klaas Smits River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | South Africa |
| Subdivision Type3: | Province |
| Subdivision Name3: | Eastern Cape Province |
| Length: | 40km (30miles) |
| Source1: | Stormberg |
| Source1 Location: | Near Molteno, Eastern Cape, South Africa |
| Source1 Elevation: | 1800m (5,900feet) |
| Source Confluence: | Swart-Kei / Wit-Kei |
| Mouth: | Confluence with Black Kei River |
| Mouth Coordinates: | -32.0289°N 26.9333°W |
| Mouth Elevation: | 1003m (3,291feet) |
| Tributaries Left: | Komani River |
The Klaas Smits River (Afrikaans: Klaas Smitsrivier) is a river part of the Great Kei River system in the Eastern Cape, South Africa. It originates south of Molteno and flows through Sterkstroom, first southwards and then southeastwards before joining up with the Black Kei River. Presently the Klaas Smits River is part of the Mzimvubu to Keiskama Water Management Area.[1]
The Komani River is a tributary of the Klaas Smits, joining its left bank 5 km south of Queenstown.
The basin of this river saw much commando activity during the Second Boer War.[2]