The Sviyaga (Russian: Свияга; Tatar: Зөя; Chuvash: Сĕве, Sĕve) is a river in the Ulyanovsk Oblast and Tatarstan, a right tributary of the Volga.

It freezes up in November or December and stays icebound until April or May.

Major tributaries are the Arya, Birlya, Bula, Karla, Kubnya, Sulitsa and Tosha rivers.

The castle of Sviyazhsk, which dates to 1551, is on the island in Sviyaga Cove of the Kuybyshev Reservoir.

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