Toʻrtkoʻl (Uzbek: Toʻrtkoʻl/Тўрткўл; Karakalpak: Tórtkúl/Төрткүл, also spelled as Turtkul, is a city in Karakalpakstan, Uzbekistan and the administrative center of the Toʻrtkoʻl District. Its population is 58,200.

Karakalpakstan, officially the Republic of Karakalpakstan, is an autonomous republic of Uzbekistan. It spans the northwestern portion of Uzbekistan. The capital is Nukus. Karakalpakstan covers an area of 166,590 km2 (64,320 sq mi), and has a population of about 2 million people. Its territory covers the classical land of Khwarazm, which in classical Persian literature was known as Kāt (کات).