The Deyma (ru|link=no|Дейма; de|link=no|Deime; lt|link=no|Deimena) is a river in Russia's Kaliningrad Oblast. It separates from the Pregolya at Gvardeysk, flows through Polessk, and ends at the Curonian Lagoon. The Polessk Canal connects the Deima with the Nemunas.