In this paper, a new model based on the Johnson-Cook fracture criterion is proposed to predict the ductility of Ti6Al4V titanium alloy sheets deformed at wide range of temperatures (25–900°C) and stress states. Experiments were carried out and strain at fracture recorded on samples of different shapes to cover various loading conditions: uniaxial tensile, shear and equi-biaxial plane stress tension. The stress triaxiality and the deviatoric effect were evaluated through numerical simulations of these experiments. The original Johnson-Cook (J-C) fracture strain criterion was modified to incorporate a quadratic function of the stress triaxiality and a deviatoric parameter to represent different stress states. In the new formulation of the J-C criterion, a quadratic function of the temperature was also introduced to represent the transformation related ductility inherent in the two phase (α/β phases) titanium alloy Ti6Al4V at elevated temperatures. The model was calibrated using as reference state the strain rate of 1s−1 and temperature of 600°C. The choice of 600°C as reference was based on the rapid increase in the β phase and ductility above this temperature. The new ductile fracture criterion for elevated temperature sheet forming was finally validated using testing conditions different from those used in its derivation.