Calca may refer to: Calca Peninsula, a peninsula in South Australia Calca Province, one of thirteen provinces in the Cusco Region of Peru Calca District, one of the eight districts in the Calca Province Calca, Peru, capital of the Calca District and Province Calca, South Australia, a settlement on the west coast of Eyre Peninsula CALCA, the abbreviation for calcitonin-related polypeptide alpha