The solubility of hydrogen sulphide in pure water and in NaCI solutions has been studied experimentally from 20 to 320~ and at saturation pressures. Hydrogen sulphide solutions in equilibrium with their vapor phase were contained in a pressurized titanium bellows of known total volume. The bellows transmitted inside-vapor pressures via a thermally stable oil (pressure medium) to a highprecision pressure sensor. Temperatures were measured by a sheathed thermocouple immersed into the oil sourrounding the bellows. Values for the Henry constants were derived from measurements of equilibrium vapor pressure, volume, temperature, and bulk composition. The Henry constants agree well with previously published data up to about 200~ but then deviate towards lower values (higher solubilities) at higher temperatures. Henry constants from 20 to 320~ and at saturation pressures may be obtained from the correlation