Siletiteniz (Kazakh: Сілетітеңіз, Sıletıteñız), also Seletyteniz, Seletytengiz is an endorheic salt lake located in the Ishim Plain, part of the West Siberian Plain.

The lake lies in North Kazakhstan, with the Pavlodar Region border running along the eastern lakeshore and the Kazakhstan-Russia border 6 kilometers (3.7 mi) to the north of the northeastern end.

[3] Teniz is Kazakh for "sea", while the etymology of Selety is less clear.

The lake reaches a maximum depth of 3.2 metres (10 ft)[1] and has a volume of about 1.5 cubic kilometres (0.36 cu mi).

[1] The river Sileti, which is 407 kilometres (253 mi) long and drains an area of 18,500 square kilometres (7,100 sq mi), sometimes reaches the lake during high water but usually dissipates into the marshes south of the lake.