Siksika 146 is a
First Nations reserve in southern Alberta, Canada. It has a land area of 696.54 km², making it the second-largest Indigenous reserve in Canada. It is located 87 kilometres southeast of Calgary and is inhabited by members of the Siksika Nation. It is bordered by Vulcan County, Wheatland County, and the County of Newell, and is located at an elevation of 857 metres. The Canada 2011 Census reported a population of 2,972 inhabitants. The reserve is home to the Blackfoot Crossing historical park.