Alberta Provincial Highway No. 2A is the designation of nine alternate routes off Highway 2 in Alberta, Canada. In general, these are original sections of Highway 2, such as the southern portion of Macleod Trail in Calgary. They passed through communities before limited-access freeways were built to shorten driving distance, accommodate heavier volumes and to bypass city traffic. Portions of the alignment of Highway 2A follow the route of the former Calgary and Edmonton Trail.
Major sections include Barlow Trail within Calgary, and several stretches of 2A branching off the main road and accessing Okotoks, High River, Olds, Red Deer, Wetaskiwin, and numerous other major towns and cities.