The solubility of nitrogen in cyclohexane was measured at pressures up to 16 atm and at temperatures from 20 to 170 °C. The solubility of air was measured at similar pressures up to 100 °C and the nitrogen data were used to deduce the oxygen solubility. Some additional data at atmospheric pressure were obtained using a gas chromatographic technique. Standard methods of correlating solubilities were applied to the data. The entropy of the solution was found to be constant over the temperature range for oxygen, while for nitrogen it was found that extrapolation of existing data would result in a lower solubility than that obtained in this work.