Chlorine-35 and ^121,123Sb n.q.r. frequencies and their temperature dependencies for various octahedral complexes of antimony pentachloride, SbCl₅L (L = donor ligand), are reported. Assignments of ³⁵Cl resonances to axial or equatorial chlorine atoms of the SbCl₅ fragment have been possible in some cases. There are no apparent systematic differences between the frequencies of the axial or equatorial chlorine atoms, such differences as there are being masked by crystal-field effects of similar magnitude.