Kozmodemyanovka (Russian: Козьмодемьяновка) is a rural locality (a selo) and the administrative center of Kozmodemyanovsky Selsoviet of Tambovsky District, Amur Oblast, Russia.

Kozmodemyanovka is located on the Gilchin River, 18 km northeast of Tambovka (the district's administrative centre) by road.

Chuyevka is the nearest rural locality.

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