The Qudyal or Qudyalchay (Azerbaijani: Qudyalçay) is a river in north-eastern Azerbaijan.

[1] The Qudyal starts at the northern slope of Tufan Dagh in Greater Caucasus, at 3,000 meters above sea level in Quba District.

The river ends its stream by flowing into the Caspian Sea through Khachmaz District.

Average annual water consumption is 6,85 cubic meters per second.

From April to July, the river floods due to melting of the snow and increase in water.