The solubility of ethylene was measured a t pressures up to 0.64 MPa, at silver nitrate concentrations from 1.0 to 6.0 M, and over a temperature range from 278 to 308 K. From the temperature dependence of the solubility, values were determined for enthalpy and entropy changes. The solubility of ethylene increased with increase in pressure, increase in silver nitrate concentration, and decrease in temperature.The results for the solubility of ethylene in 2.0,4.0, and 6.0 M aqueous silver nitrate at 298 K are in good agreement with the earlier measurements of Hughes and co-workers. The enthalpy and entropy of solution were found to increase with silver nitrate concentrations from 1.0 to 6.0 M; at 1.0 M AgNO3 the enthalpy was -21.9 kJ.mol-I and the entropy was -62.5 Jnol-l*K-l; at 6.0 M AgNO3 the enthalpy was -24.9 kJmo1-I and the entropy was -65.3 J-mo1-l-K-l. The ethylene solubility in aqueous silver nitrate was empirically correlated as a function of system pressure (PI, temperature (T), and silver nitrate concentration (c), and the correlation fits the data with an average error of f8%.