Laboratory measurements of the relative absorption cross sections of ozone at temperatures 195, 228 and 295 K have been made throughout the 185 to 254 nm wavelength region. The absolute absorption cross sections at the same temperatures have been measured at several discrete wavelengths in the 185 to 250 nm region. The absolute cross sections of ozone have been used to put the relative cross sections on a firm absolute basis throughout the 185 to 255 nm region. These recalibrated cross sections are slightly lower than those of L.T. Molina and M.J. Molina (Journal of Geophysical Research 91, 1450, 1986), but the differences are within a few percent and would not be significant in atmospheric applications. ¿American Geophysical Union 1993