The solubilities of hydrogen sulfide in water (1) + monoethanolamine (2) + 2-amino-2-methyl-1-propanol (3) have been measured at 40, 60, 80, and 100-degrees-C and at partial pressures of hydrogen sulfide ranging from 1.0 to 180 kPa. The ternary mixtures studied were omega2 = 0, omega3 = 0.3; omega2 = 0.06, omega3 = 0.24; omega2 = 0.12, omega3 = 0.18; omega2 = 0.18, omega3 = 0.12; and omega2 = 0.24, omega3 = 0.06 where omega is the mass fraction. The model of Kent and Eisenberg has been extended to represent the solubility of H2S in the ternary mixtures. The model reasonably reproduces the equilibrium partial pressure of H2S above the ternary mixtures, not only over a temperature range from 40 to 100-degrees-C, but also at various compositions of the components in the ternary mixture.