We present the results of an extensive validation program of the most recent version of ozone vertical pro-files retrieved with the IMK/IAA (Institute for Meteorol-ogy and Climate Research/Instituto de Astrofísica de An-dalucía) MIPAS (Michelson Interferometer for Passive At-mospheric Sounding) research level 2 processor from ver-sion 5 spectral level 1 data. The time period covered corre-sponds to the reduced spectral resolution period of the MI-PAS instrument, i.e., January 2005–April 2012. The compar-ison with satellite instruments includes all post-2005 satellite limb and occultation sensors that have measured the vertical profiles of tropospheric and stratospheric ozone: ACE-FTS, GOMOS, HALOE, HIRDLS, MLS, OSIRIS, POAM, SAGE II, SCIAMACHY, SMILES, and SMR. In addition, balloon-borne MkIV solar occultation measurements and ground-based Umkehr measurements have been included, as well as two nadir sensors: IASI and SBUV. For each reference data set, bias determination and precision assessment are per-formed. Better agreement with reference instruments than for the previous data version, V5R_O3_220 (Laeng et al., 2014), Published by Copernicus Publications on behalf of the European Geosciences Union. 3972 A. Laeng et al.: Validation of MIPAS IMK/IAA V5R_O3_224 ozone profiles is found: the known high bias around the ozone vmr (vol-ume mixing ratio) peak is significantly reduced and the verti-cal resolution at 35 km has been improved. The agreement with limb and solar occultation reference instruments that have a known small bias vs. ozonesondes is within 7 % in the lower and middle stratosphere and 5 % in the upper tro-posphere. Around the ozone vmr peak, the agreement with most of the satellite reference instruments is within 5 %; this bias is as low as 3 % for ACE-FTS, MLS, OSIRIS, POAM and SBUV.