The crystal structure of the title compound, [RhI(C18H15Sb)(3) (CO)], represents a rare example of a crystallographically characterized five-coordinate Rh-I-SbPh3 complex. The compound crystallizes with the I-Rh-CO core on a threefold rotation axis, with three crystallographically equivalent triphenylstibine ligands. Selected geometric parameters are: Rh-I = 2.7159 (8), RhDSb = 2.5962 (4), Rh-C-CO = 1.825 (6) and C-CO-O 1.153 (6) Angstrom, and Sb-Rh-I = 89.374 (10) and Sb-Rh-C-CO = 90.626 (10)degrees. The cone angle of the SbPh3 ligand was determined as 137degrees, according to the Tolman model.