Katpagan (Kazakh: Қатпаған) is a salt lake in Amangeldi District, Kostanay Region, Kazakhstan.

[1] The lake is located 52 kilometers (32 mi) to the south of Amangeldi, the district capital.

[2] Katpagan is an endorheic lake of the Turgay Depression and is part of the Uly-Zhylanshyk river basin.

[1] Katpagan has a roughly semicircular shape, stretching for over 4 kilometers (2.5 mi) in an east–west direction.

Katpagan partly dries in the summer, the shores becoming a salt marsh as the water recedes.