| Official Name: | Mokraya Olkhovka |
| Native Name: | Мокрая Ольховка |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Volgograd Oblast#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Volgograd Oblast |
| Subdivision Name3: | Kotovsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +4:00 |
| Coordinates: | 50.4667°N 103°W[1] |
Mokraya Olkhovka (ru|Мокрая Ольховка) is a rural locality (a selo) and the administrative center of Mokroolkhovskoye Rural Settlement, Kotovsky District, Volgograd Oblast, Russia. The population was 860 as of 2010.[2] There are 18 streets.[3]
Mokraya Olkhovka is located in steppe, on Volga Upland, on the Mokraya Olkhovka River, 30 km northeast of Kotovo (the district's administrative centre) by road. Kryachki is the nearest rural locality.[4]