The research outlined in this letter provides an initial demonstration of Mg-mediated NH3 synthesis, serving as proof of concept. We achieved a maximum NH3 FE of 25.28 ± 3.8% at a current density of -45 mA/cm 2 which amounts to NH3 current density of -11.3 ± 1.77 mA/cm 2 . While lithium-mediated NH₃ synthesis (Li-NRR) has made significant progress, the scarcity of lithium and its highly negative plating potential (~-3.04 V vs SHE) limit scalability and energy efficiency. Calcium has been explored as an alternative, achieving NH₃ FE values around 50%, though with cell voltages exceeding 3 V, making it less practical. In contrast, this study presents a Mg-NRR process, where N₂ is activated on magnesium to form nitride, followed by its protolysis to produce NH₃, coupled with the regeneration of Mg sites. This approach demonstrates the potential for magnesium as a more sustainable and energy-efficient mediator, paving the way for future research into Mg and other metals beyond lithium for ammonia production. In this study, we validated our theoretical hypothesis of a reduced plating potential for Mg compared to Li and Ca. Remarkably, using Mg-NRR, we achieved ammonia synthesis at a working electrode potential as low as 3V. Furthermore, we found that NH3 FE remains constant for various current densities. However, the process encounters several challenges that must be addressed for further development. One major obstacle is the limited solubility of Mg salts in the solvents explored in this study. Future investigations should focus on screening the solubility of different Mg salts in various aprotic solvents. This exploration would facilitate the testing of different salt and electrolyte configurations for Mg-mediated NH3 synthesis, ultimately leading to an optimal setup to maximize NH3 FE and lower the total cell potential, thereby enhancing the overall energy efficiency of the process. Additionally, the role of the SEI in determining NH3 FE remains poorly understood. In-situ studies to probe the SEI are necessary to gain insights into its influence on the synthesis process. Overall, the findings presented here pave the way for future research on NH3 synthesis utilizing Mg and other materials beyond lithium as potential mediators.