| Official Name: | Ploskoye |
| Native Name: | Плоское |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Altai Krai#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Name1: | Altai Krai |
| Subdivision Name3: | Tretyakovsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +7:00 |
| Coordinates: | 50.85°N 91°W[1] |
Ploskoye (Russian: Плоское) is a rural locality (a selo) and the administrative center of Ploskovsky Selsoviet, Tretyakovsky District, Altai Krai, Russia. The population was 737 as of 2013.[2] There are 6 streets.
Ploskoye is located 33 km southeast of Staroaleyskoye (the district's administrative centre) by road. Yekaterininskoye is the nearest rural locality.[3]