This paper describes a method for the recycling and regeneration of used perfluorosulfonic Nation(R) (Dupont) membranes by dissolution and recasting. The dissolution of the used Nafion(R) membranes from polymer electrolyte fuel cells is realized using dimethyl sulfoxide as a solvent under atmospheric pressure and 190 degreesC. A mechanically robust membrane can be reproduced by a recast process of the dissolved Nafion(R) solution at 170 degreesC. The recycled membrane has shown a good crystalline structure and high mechanical strength. Membrane properties, including water uptake, exchange capacity and resistance are similar to that of the as-received Nafion(R) 115 membrane. Fuel cells prepared by the recycled membrane demonstrate a comparable performance to that of the fresh fuel cell.