Background & objectives: Construction of new service centers including hospitals is expensive and requires optimal site selection for these centers so that all citizens benefit from its increased productivity. It can also help them lower their costs. This study investigates the optimal locations for construction of hospitals in Ardabil using GIS software.

Methods: This is an applied research which incorporates a descriptive-analytic methodology. The data is made up of 11 criteria; proximity to densely populated areas, proximity to green space, closeness to main thoroughfares, proximity to fire departments and distance from existing hospitals, industrial centers, slopes, learning centers, cemetery, military bases and from sport facilities. They were all weighted using analytic network process (ANP) model.

Results: After performing the necessary calculations and evaluations, the highest and lowest weight of criteria belonged to the proximity to densely populated areas (0.229) and distance from the cemetery (0.033), respectively. According to the criteria weights and overlapping of layers, the most and least favorable locations for the establishment of hospitals were identified.

Conclusion: Results of the classification showed the best location for construction of hospitals in Ardabil city based on four municipal regions. In region one it belongs to the 8^th, 5^th, 2^nd, and 11^th districts in region two districts of 6 and 7 which cover southeastern edge of the city, in region 3 districts of 1, 2, 6, 7, 8 and 10 which contain the western part of the city, and in region four it belongs to districts of 1, 2, 6, 7, 10 and 11 that encompass the blocks in the northern and north-western route of the city. These regions can be used for construction of new hospitals in order to improve people’s access to healthcare services.