The vapor pressure of HFO-1234ze(E) (trans-1,3,3,3-tetrafluoropropene) was measured from 235 to 381 K for pressures from 40 to 3493 kPa using a Burnett apparatus. The temperature measurement uncertainty was estimated to be 2.3 mK, and the pressure uncertainty was estimated to be 600 Pa. A Wagner-type equation was used to correlate the vapor pressure of HFO-1234ze(E) based on the experimental data. This vapor equation has five coefficients and correlates the vapor pressure data of this work with a maximum relative deviation of 0.00082.