The absorption cross sections for methylchloroform (CH3CCl3) have been measured in the gas phase (from 160 to approximately 240 nm) and in the liquid phase (from approximately 235 to 260 nm) over the temperature range 220--330 K. The liquid phase results were converted into effective gas phase cross sections using a wavelength shift procedure described and verified in earlier work. The results are compared with other available data in the wavelength region 185--240 nm. The multiplicity of measurements in different laboratories lends increased confidence in the quantification of uncertainties in the atmospheric (photolysis and kinetic) lifetime calculations for this important chemical species. ¿ American Geophysical Union 1995