Diezma is a municipality in the province of Granada, in the autonomous community of Andalusia, southern Spain. It is located in the comarca (district) of Guadix, within the foothills of the Sierra de Huétor.
The town lies close to the A-92 motorway, which connects Granada with Almería and other parts of eastern Andalusia. Its surrounding landscape is characterised by semi-arid terrain and cereal cultivation typical of the Guadix plateau.