The rate coefficient of the reaction O++NO→O+NO+ has been measured as a function of the ion kinetic energy using a drift tube-mass spectrometer apparatus. The rate coefficient decreases slowly from a value of (8.0¿1.2) ¿10-13 cm3/s at 300¿K to a minimum of ~7¿10-13 cm3/s at 0.1 eV and then increaes to a value of (5.7¿0.9) ¿10-12 cm3/s at 0.55-eV ion mean energy. Thus under expected auroral conditions the charge transfer reaction would neither provide a significant source of NO+ nor a significant removal of O+ ions.