The Banff Formation is a stratigraphical unit of Devonian age in the Western Canadian Sedimentary Basin.

The Banff Formation extends from the 49th parallel in southern Alberta and the Kootenays region of British Columbia to north-eastern British Columbia, northern Alberta and the District of Mackenzie in the Northwest Territories.

The age of the formation ranges from late Famennian to Tournaisian.

An unconformity is observed between Banff and the Rundle Group in outcrop.

It can be correlated with the Besa River Formation in north-eastern British Columbia.