Solubility of 6-caprolactam in supercritical carbon dioxide was measured at temperatures from 307 K to 324 K and pressures from 100 bar to 230 bar. The mole fraction solubilities ranged from 0.02 to 0.07. A static variable volume view cell apparatus was used for the measurements. The solubility data were modeled using the Peng-Robinson equation of state with two adjustable mixture parameters.