Measurements of ferroelectric properties were carried out on n.9 nylon films (n = 5; 7; 9), which is the objective of the work. The samples for the tests were obtained in the form of a film, taking into account the control of crystallinity and mechanically orienting them in an open roller laminator at determined temperatures. Crystallinity was evaluated, qualitatively, by differential scanning calorimetry and X-ray diffraction. The specimens were metallized in a high vacuum evaporator, performing the ferroelectricity tests at room temperature. In addition, tests were carried out under the same conditions with poly(vinylidene fluoride) for comparison. The hysteresis loop obtained for nylon 9.9 presents a remanent polarization of 30 mC m−2 and a coercive field of 120 MV m−1; no ferroelectric response was obtained in nylons 5.9 and 7.9, an aspect that is also analyzed in the work.