The Bostobe Formation (Kazakh: Boztóbe svıtasy) is a geological formation in Qaraghandy & Qyzylorda, Kazakhastan whose strata date back to the Late Cretaceous (Santonian to early Campanian stages, approximately 85 Ma).

The sandstones and claystones of the formation were deposited in estuarine, fluvial-lacustrine and fluvial-deltaic environments.

Dinosaur remains are among the fossils that have been recovered from the formation. The formation is about 45 metres (148 ft) thick and consists primarily of clay with interbeds of sand, representing an estuarine environment.

Khunnuchelys lophorhothon, a trionychid turtle recovered from the formation, was initially thought to belong to a hadrosaurid dinosaur and classified as cf. Lophorhothon sp.

• List of dinosaur-bearing rock formations
• List of fossiliferous stratigraphic units in Kazakhstan
• Bissekty Formation
• Madygen Formation
• Karabastau Formation
• Kugitang Svita

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