The Sn atom in the title compound, [Sn(C6H5)2(C8H14N3S)Cl], is pentacoordinated with a trigonal-bipyramidal coordination geometry. The 1-cyclopentylidene-4-ethylthiosemicarbazidate (cpetsc) ligand coordinates through the S atom and the N atom bonds to the cyclopentyl group, forming a five-membered ring with the Sn center. The chloride ligand and the coordinated N atom are in axial positions. In the crystal structure, intermolecular N—H...Cl hydrogen bonds form chains along [101].