Fuensanta de Martos is a municipality in the province of Jaén, in the autonomous community of Andalusia, southern Spain. It is located in the comarca (district) of Sierra Sur de Jaén, within the foothills of the Sierra de la Pandera, roughly 20 kilometres south of the provincial capital, Jaén.
The town sits at an elevation of about 720 metres above sea level, on the northern slopes of the Sierra de la Pandera, overlooking the valley of the Río Grande. Its name derives from the Spanish words "fuente santa," meaning "holy fountain," a reference to the springs in the area.
Fuensanta de Martos has a population of approximately 3,000 inhabitants, according to 2024 figures from the Instituto Nacional de Estadística (INE). The local economy has traditionally been based on agriculture, particularly the cultivation of olives, which is common throughout the province of Jaén, one of the world's leading olive-producing regions.