The Deyma (Russian: link=no|Дейма; German: link=no|Deime; Lithuanian: 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.