Ploskoseminsky (Russian: Плоскосеминский) is a rural locality (a settlement) and the administrative center of Ploskoseminsky Selsoviet, Rebrikhinsky District, Altai Krai, Russia.

Ploskoseminsky is located 18 km southeast of Rebrikha (the district's administrative centre) by road.

Dalny is the nearest rural locality.

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