Calca

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