The Zelvyanka (; ; ) is a river in Belarus, a left tributary of the Neman.
The river originates between the villages of Lidzyany (Лідзяны, Лидяны) and Kulyavichy (Кулявічы, Кулёвичи) in Svislach District and flows through Grodno Region and Brest Region (Vawkavysk District, Pruzhany District, Zelva District and Masty District).
Its tributaries are Shchyba, Ruzhanka, Ivanawka, Sasva, Samarawka, and Yukhnawka.
Settlements: Masty (by the mouth), Zelva, Papyernya.
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