The Ni atom in [Ni(C6H4CIS)(C5H5)(C18H15P)] has a distorted trigonal geometry, with bond angles Cp-Ni-S 132.3 (1), Cp-Ni-P 135.3 (5) and P-Ni-S 92.4 (1)degrees, where Cp represents the centroid of the C5H5 ring. The bond distances Cp-Ni, Ni-S and Ni-P are 1.763 (1), 2.190 (1) and 2.144 (1) Angstrom, respectively, which are close to distances found in similar compounds. A structural model with disordered cyclopentadienyl ligands was used.