Coordinates: 60°50′N 171°40′E / 60.833°N 171.667°E / 60.833; 171.667

Machevna Bay (Russian: бухта Мачевна) is a bay in Koryak Okrug of Kamchatka Krai, Russia, located approximately 350 kilometers (220 mi) (by air) north of Tilichiki. Machevna River flows into this bay.