The Lea Park Formation is a stratigraphical unit of Late Cretaceous age in the Western Canadian Sedimentary Basin, Canada.

It takes the name from the settlement of Lea Park, Alberta, located north-west of Lloydminster on the banks of the North Saskatchewan River.

[2] The early campanian age was determined from its foraminifera and mollusks found in the formation.

The Lea Park Formation is composed of dark shale with minor siltstone.

[1] Calcite veins and ironstone concretions, as well as bentonite beds are found throughout the formation.