Today’s world relies upon advanced green technologies that are made of critical elements with unique properties. Examples include rare earth elements (REES) that are critical in the manufacturing of wind turbine and electric/hybrid vehicle batteries, key components of a greener future, but facing supply uncertainty and near zero recycling. To tackle their supply changes, activities have begun for their urban mining from waste electrical and electronic equipment (WEEE) that contain considerable amount of REEs, but their current level of recycling is less than 1%. Current recycling practices use either pyrometallurgy, which is energy intensive, or hydrometallurgy that utilizes large volumes of acids and solvents and generate large volumes of hazardous waste. In this study, we developed a novel and sustainable process to recycle REEs from WEEE, in particular NiMH battery. The developed process relies on supercritical fluid extraction (SCFE) utilizing CO2 as the solvent, which is abundant, safe, cost effective, and inert. The effect of seven operating parameters, namely temperature, pressure, residence time, sample to chelating agent ratio, agitation rate, complex formulation, and methanol addition, on the REE extraction efficiency was investigated, and optimum operating conditions were determined. This work is the first to utilize a very efficient and safe process that runs at low temperature to extract metals from postconsumer products with minimum hazardous waste generation, while offering about 90% leaching efficiency for REEs. We expect our process find widespread applicability in urban miming of REEs using a green chemistry.