| Koshtan-Tau | |
| Elevation M: | 5144 |
| Elevation Ref: | [1] |
| Map: | Caucasus mountains#Russia Kabardino-Balkaria |
| Location: | Kabardino-Balkaria, Russia |
| Range: | Caucasus Mountains |
| Coordinates: | 43.05°N 43.2167°W |
| First Ascent: | 1889 |
Koshtan-Tau (Russian: Коштан-тау; Karachay-Balkar: Къоштан-тау, means paired mountain) is the highest peak (5,144m) of the Koshtan massif of the central Caucasus Mountains in the Kabardino-Balkaria Republic of Russia, near the border with Georgia. The peak was first ascended in 1889 by Herman Woolley and party.