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The Ghezel Ozan (Azerbaijani: Qızılözən (Red River), Persian: قزل اوزن / Qezel Owzan) (also spelled Ghezel Ozen) is one of the longest rivers in Iran, originating from the Chehel Cheshmeh Mountains between Saqqez and Divandarreh in Kurdistan Province flowing in northern Iran.
It flows through Kurdistan Province, Zanjan Province, East Azerbaijan Province, Ardabil Province, and Gilan Province.
It is one of two tributaries forming the Sefid-Rud river, with the Shahrood. The Sefīd-Rūd is a major river and tributary of the Caspian Sea. Its catchment area is about 48,600 km2 (18,800 sq mi).