Kostino-Otdelets (Russian: Костино-Отделец) is a rural locality (a selo) and the administrative center of Kostino-Otdelskoye Rural Settlement, Ternovsky District, Voronezh Oblast, Russia.

[3] Kostino-Otdelets is located 24 km southwest of Ternovka (the district's administrative centre) by road.

Zarechye is the nearest rural locality.

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