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The title compound, C30H23IO2P2S2, was synthesized by the reaction of 2-iodobenzene-1,3-diol, chlorodiphenylphosphine, Et3N and sulfur. The P=S bonds project to opposite sides of the central aromatic ring. The O—P—S and C—P—S bond angles are significantly larger than the O—P—C and C—P—C bond angles, indicating significant distortion of the tetrahedral geometries of the P atoms. The P=S bond lengths of 1.9311 (13) and 1.9302 (12) Å in the title compound are shorter than that found in Ph3P=S [1.950 (3) Å] because the replacement of one C atom attached the P atom by an O atom increases the effective electronegativity of the P atom.