Akchakhan-Kala, or Akcha-khan Kala, also named after the locality Kazakly-Yatkan/ Kazakl'i-Yatkan, in modern Karakalpakstan, Uzbekistan, was an ancient fortress in Chorasmia built in the 4th/ 3rd century BCE and occupied until it was despoiled in the 2nd century CE.

[2][3] It is part of the "Fifty fortresses oasis" in modern-day Uzbekistan.

[4] The abandonment of Akchakhan-Kala was apparently followed by the establishment of the new capital of Toprak-Kala, 14 km to the northeast.

[5] Akcha-khan Kala has been the object of numerous excavations, still ongoing.

[5] Many decorations have been found, belonging to the period from the 1st century BCE to the 2nd century CE: a large quantity of frescoes, unbaked-clay modelled sculptures including fragments of a Ketos in Hellenistic style, and a Zoroastrian fire altar with paintings of colossal Avestan gods.