Sosna (vene Cосна, Быстрая Сосна) on jõgi Venemaal.
Saab alguse Kesk-Vene kõrgustikult Orjoli oblastis ja voolab alguses lõunasse, pöörab siis itta ja kirdesse ning suubub paremalt Doni jõkke.
Pikkus 296 km, valgla 17 400 km².
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