Cardston-Siksika is a provincial electoral district in Alberta, Canada.

The district is located in southern Alberta, stretching from Namaka (east of Calgary) to the border with Montana.

The district was created in 2017 when the Electoral Boundaries Commission recommended reducing the number of districts in southern Alberta due to relatively slow population growth.

The first suggestion of the Boundary Commission was the "Taber/Vulcan" riding which extended from north of Vulcan to the Canada/U.S border, east to the Alberta/Saskatchewan border, north to Medicine Hat and west to the Bow River.

Little Bow MLA Dave Schneider presented at all Boundary Commission meetings that Taber/Vulcan was much too large.