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