Amphos 21 is a scientific, technical and strategic consulting company that was established in 1994 in Barcelona, Spain, as a specialist, scientific radioactive waste management consultancy. Today, the company has diversified to offer scientific and strategic environmental consulting to the nuclear, mining, water resources, sustainability and oil and gas sectors. The business has its headquarters in Spain and operates subsidiaries in Chile (founded in 2009) and Peru (founded in 2012).

Mining is the main industry served by Amphos21, especially in Peru and Chile. In Spain, Amphos 21 works largely in the nuclear sector and offers worldwide services covering the whole nuclear-fuel cycle and the impacts associated with radioactive material in the environment.