The Willow Creek Formation is a stratigraphic unit of Late Cretaceous to Early Paleocene age in the Western Canada Sedimentary Basin of southwestern Alberta.

Williams and Dyer defined the type section in 1930 at the mouth of Willow Creek, east of Fort Macleod.

[6] The sediments were eroded from the Canadian Cordillera, and were transported eastward by river systems and deposited in fluvial channel and floodplain environments.

This contrasts with the equivalent Scollard Formation north of the Bow River, which includes coal deposits indicative of a more humid environment.

The Willow Creek Formation is present in southwestern Alberta, south of the Bow River, and extends a short distance into northern Montana.