The coordinated water molecule in the title compound, aqua(4-chlorophenyl)(1,3-dioxoisoindoline-2-acetato-O)diphenyltin(IV), [Sn(C6H5)(2)(C6H4Cl)(C10H6NO4)(H2O)], is hydrogen bonded to the carboxyl [O ... O 2.695 (4) Angstrom] and amido [O ... O 2.900 (5) Angstrom] O atoms of adjacent molecules, resulting in a layer structure. The Sn atom shows trans-C3SnO2 trigonal bipyramidal coordination.