The Kígyós (Serbian Cyrillic: Плазовић) or Kiđoš (Hungarian: Kígyós; Serbian Cyrillic: Киђош), is a river in southern Hungary and northern Serbia.

The streams meet at Felsőszentiván and continue to the south, next to the villages of Bácsbokod and Bácsborsód.

The river comes close to the Serbian border but turns west, flowing next to the village of Katymár.

In Serbia, the river turns west, flowing only within the area of Sombor municipality of the province of Vojvodina.

East of Bezdan, the river turns south before it empties into the Great Bačka Canal, near the village of Bački Monoštor.