Vapor pressure and enthalpies of sublimation data for sterols are desirable engineering parameters in the separation of sterols from plant materials by vacuum pyrolysis or supercritical fluid extraction. In this study, vapor pressures of cholesterol, ergosterol, beta-sitosterol, and stigmasterol were measured by an isothermal Knudsen effusion method. The vapor pressure correlations were fitted to the following equations: cholesterol ln(p/Pa)= -17136/(T/K) + 39.88 (from (386 to 414) K); ergosterol ln(p/Pa)= -17686/(T/K) + 40.61 (from (381 to 412) K); P-sitosterol ln(p/Pa) = -17295/(T/K) + 39.7 (from (389 to 410) K); and stigmasterol ln(p/Pa) = -20254/(T/K) + 46.31 (from (390 to 417) K).