The electronic structure of the skutterudites CoSb 3 , CoP 3 , LaFe 4 Sb 12 , and CeFe 4 Sb 12 has been investigated with x-ray photoelectron spectroscopy. The binding energies in the pnicogen and transition metal 2p spectra are shifted to reflect changes in the bonding character of these compounds. The asymmetric line shapes in the metal 2p spectra signal electronic delocalization. A plasmon loss satellite peak occurs in the Co 2p spectra of CoSb 3 and CoP 3 . The intensity of this peak in these and other Co-containing compounds increases with greater occupancy of the Co 3d band. The presence of trivalent rare earth was confirmed from the La and Ce 3d spectra, both of which contain shake-up satellite peaks. A second satellite peak, attributable to two-core-hole processes, also appears in the La 3d spectrum of LaFe 4 Sb 12 but not in LaFe 4 P 12 , indicating the involvement of La-Sb covalent bonding and the population of La 4f conduction states in the former. This peak is absent in the Ce 3d spectrum of CeFe 4 Sb 12 because a 4f 1 state is located below the Fermi edge. Fitting of the valence band spectra for all four compounds led to the formulations ͑Co 3+ ͒͑Pn 1− ͒ 3 and ͑R 3+ ͒͑Fe 2+ ͒ 4 ͑Sb 1− ͒ 12 , with the electron deficiency in the rare-earth containing compounds being represented by a hole in the valence band.