Potential energy curves and theoretical spectroscopic constants are obtained for 18 electronic states of ScCl molecule in the representation 2s+1 Λ +/− by CASSCF/MRCI calculations in all electron schemes for both atoms scandium and chlorine. The theoretical computational results of the lowest 10 singlet states and of 5 triplet states are in good agreement with experimental values and confirm the relative order of these states. In this work, three unobserved triplet states (2) 3 Π, (1) 3 Σ − and (3) 3 Π are predicted for the first time in the transition energy range of 22500cm −1 .