The pressure dependence of the pyroelectric coefficientPywas determined from atmospheric pressure to 7 kbar over a temperature range from −80 to +48 °C for poled uniaxially oriented poly (vinylidene fluoride) film. The effect of the glass transition onPyas a function of pressure is compared to the pressure dependence of the glass‐transition temperature obtained from dielectric studies. The ratio ofdp, the hydrostatic pressure piezoelectric coefficient, toPyis presented as a function of both temperature and pressure. The details of a high‐pressure system design for these measurements are also presented.