The electronic spectroscopy and photodissociation dynamics of the I-3 radical are investigated with two experimental methods. The ground and several low-lying excited states of the I-3 radical are characterized by photoelectron spectroscopy of I-3(-) at 213 nm. Assignments of these states are discussed with reference to recent calculations. In addition, photodissociation of the I-3 radical was investigated at selected photon energies (4.59, 4.96, and 5.17 eV) by fast radical beam photofragment translational spectroscopy. Two product channels were observed with mass ratios of 1:2 and 1:1, and translational energy (P(E-T)) distributions were measured. The P(E-T) distributions for products with mass ratio 1:2 show that this channel corresponds to I-2 in various electronic states along with atomic I in its P-2(3/2) or P-2(1/2) state. The 1:1 channel corresponds primarily to concerted three-body dissociation to three I atoms.