The ground and excited electronic states of the uranyl ion UO22+ are computed using relativistic core and spin-orbit potentials and multireference graphical unitary group approach configuration interaction as implemented in the COLUMBUS suite of programs. Excitation energies, symmetric stretch vibrational frequencies, and angular momentum coupling properties are compared to the extent possible with spectroscopic data from Cs2UO2Cl4 and CsUO2(NO3)(3).