Ozyorsk (Russian: Озёрск, German until 1945: Darkehmen, Lithuanian until 1945: Darkiemis) is a town in the Kaliningrad Oblast in Russia. Lying on the Angrapa river, Ozyorsk is 30 km southeast of Chernyakhovsk near the border with the Polish Warmia-Masuria Voivodship. It has a population of 5,600 as of 2004.