Abstract: A process for producing polymeric films from crystallizable polyesters, such as polyethylene terephthalate, comprising extruding a molten polymer onto a receiving surface with subsequent cooling of the polymer on said surface at 20.degree.-80.degree. C. to obtain an amorphous polymeric film. This film is heat-treated at 130.degree.-190.degree. C. to obtain a crystallinity of the film of 5-50%. Then the film is oriented at 130.degree.-250.degree. C., thermally fixed at 170.degree.-250.degree. C. and cooled at 20.degree.-30.degree. C. Polymeric films produced by the above-described method have a high structural homogeneity and elevated physical and mechanical characteristics (ultimate tensile strength up to 4000 kg/cm.sup.2, yield point up to 3500 kg/cm.sup.2).