| Kat River | |
| Name Other: | Katrivier |
| Pushpin Map: | Eastern Cape |
| Pushpin Map Caption: | Location of the Kat River in the Eastern Cape |
| Subdivision Type1: | Country |
| Subdivision Name1: | South Africa |
| Subdivision Type3: | Region |
| Subdivision Name3: | Eastern Cape |
| Length: | 150km (90miles) |
| Source1 Location: | Winterberg, Eastern Cape |
| Source1 Coordinates: | -32.5714°N 26.7594°W |
| Mouth Location: | Great Fish River, Eastern Cape |
| Mouth Coordinates: | -32.9956°N 26.7847°W |
The Kat River (Afrikaans: Katrivier) is a tributary of the Great Fish River, that drains the southern slopes of the Winterberg in the Eastern Cape Province, South Africa.
Kat, meaning "cat", is a translation of the Khoekhoen word "huncu", that apparently referred to the wildcats of the area.[1] It lent its name to Katberg, the Katberg Pass and the Kat River Settlement.
The long Kat River rises 30 km north of Fort Beaufort[1] in the Katberg escarpment of the Winterberg. At -32.9956°N 26.7847°W it forms a northern tributary of the Great Fish River, northeast of Fort Brown[1] and south of Hamburg, Eastern Cape.
It supplies the Kat River Valley with irrigation water for large citrus orchards, and supplies Seymour and Fort Beaufort with domestic water.