Strwiąż (), also known as Stryvihor or Strviazh (), is a river in Poland and Ukraine, a tributary of the Dniester. Its source is near the town of Ustrzyki Dolne, southeastern Poland. It crosses the Ukrainian border, flows through the town of Khyriv and joins the Dniester south of the town Rudky.

Description Length is , basin area is .The predominant width of the riverbed is

The river begins on the outskirts of the city Ustrzyki Dolne and then flows near the center of Khyriv dividing it into two parts running along the central area.

Interesting facts Once, there were many water mills on the Strwiąż river. About seven mills operated on a mill channel that started in Khyriv and was about long.

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