The asymmetric unit of the title compound, (C(24)H(20)P)(2)[Pt(C(7)H(5)NO(2)S(3))(2)]·H(2)O, consists of two tetra-phenyl-phospho-nium cations, two half bis-[N-(phenyl-sulfon-yl)dithio-carbim-ato]platinate(II) dianions and one water mol-ecule. The anions are completed by crystallographic inversion symmetry associated with the central Pt(II) ion. The Pt(II) ion is doubly S,S'-chelated by two symmetry-related phenyl-sulfonyl-dithio-carbimate ligands, forming a slightly distorted square-planar configuration. Besides the electrostatic attraction between oppositely charged ions in the crystal packing, intra-molecular C-H⋯O and several inter-molecular C-H⋯O, C-H⋯N and O-H⋯O hydrogen-bonding inter-actions between the cations, anions and water mol-ecules are observed.