Resonant two-photon ionization spectroscopy in a jet-cooled molecular beam has been employed for the study of the zirconium dimer (Zr-2) produced by laser ablation. More than 110 resonances have been observed in the wavelength region 610-1070 nm. Most of these resonances are transitions from upsilon " = 0 of the ground state, which is shown to be a (3) Delta state, to different vibrational levels of the excited states. Three bands have been rotationally analysed. The ground state B-value is found to be 0.0747(2) cm(-1). Radiative lifetimes have been measured for two excited states, both of them between 1 and 2 mu s.