Novel proton conducting gel electrolytes from poly(vinylidene fluoride)-dimethylformamide-H3PO4 system are synthesized and characterized by impedance spectroscopy, infra-red spectroscopy and differential scanning calorimetry. Highly conducting (5 x 10(-4) S/cm at 20 degrees C) colorless polymeric membranes are obtained in a relatively narrow component concentration range. The gel electrolytes studied are thermally stable up to 70-120 degrees C as shown by the DSC experiments.