The phase equilibria of the binary system of H2S−H2O are represented using the statistical associating fluid theory. H2S is modeled as a molecule with four association sites, i.e., two sites of type S and two sites of type H, and sites of the same type do not associate with each other. The parameters of H2S are fitted to its vapor pressure and saturated liquid density. Cross-association between the site H in H2S and the site O in H2O is allowed, and two temperature-dependent parameters are used to describe this cross-association. A temperature-dependent binary interaction parameter is used to correct the cross-dispersive energy for this binary system. Cross-parameters are fitted to mole fractions in both H2S-rich/vapor and H2O-rich phases. The model is found to represent well the phase equilibria of the H2S−H2O system from 273 to 630 K and at pressures up to 200 bar.