The paper contains reference data for the main haematologic indicators from three strains of conventional mice: Balb/c, C57BL/6 and CD1. These data listed include the mean and the standard deviation of the studied values. The animals used were divided by sex (sex ratio 1:1) and age. The study was performed in standard conditions. These strains were chosen as they are widely used for preclinical evaluations. Therefore, our data are expected to be useful for investigators conducting qualitative and quantitative toxicity studies in these mice.