Rocky View County is a municipal district in southern Alberta, Canada that is named for its views of the nearby Rocky Mountains to the west. It surrounds most of Calgary, forming the city's northern boundary and most of the city's western and eastern boundaries. At a population of 41,028 in 2021, Rocky View County is the most populous municipal district in Alberta. Though predominantly rural in nature, Rocky View County is home to 14 hamlets, including Langdon, one of Alberta's most populous hamlets. Its rural areas are home to numerous country residential subdivisions.

Langdon is a hamlet in southern Alberta, Canada under the jurisdiction of Rocky View County. It previously held village status between August 31, 1907, and January 1, 1946.