Kosonsoy also spelled as Kasansay (Uzbek: Kosonsoy / Кoсoнсoй; Tajik: Кoсoнсoй; Russian: Касансай) is a town in Uzbekistan. Kosonsoy in Namangan Province is different from the town of Koson of the Qashqadaryo Province of Uzbekistan. Kosonsoy is named after the River "Koson" which flows from high mountains of Kyrgyzstan to Turakurgan District of Namangan Province of Uzbekistan, the word "soy" in Tajik means "small river".