Geothermal is a kind of renewable energy that is always available and can be harnessed continuously. Furthermore, the environmental pollution caused by its exploitation is far less than that created by conventional fossil fuels. Meanwhile, hydrogen has an extensive application in production of petroleum and petrochemical products and is therefore an important element of Iran’s oil and gas reliant industry and economy. This paper investigates the potential of different provinces of Iran for producing hydrogen by a water electrolyzer using the electricity generated from a geothermal source. This objective is pursued by using the data envelopment analysis (DEA) method to rank and prioritize the provinces. Validity of the results obtained through this analysis was assessed by comparing them with results of TOPSIS, and VIKOR. In DEA model, the decision criteria were 13 measurable parameters, of which 5 were considered as input variables and 8 as output variables, and as mentioned above its decision-making units were the 14 Iranian provinces. The results showed that East-Azerbaijan, Bushehr and Hormozgan have the highest priority and Kerman and Sistan-Baluchistan have the lowest priority for hydrogen production via geothermal power assisted water electrolysis.