An osteometric analysis of sacral and presacral regions in three species of iberian lizards (Lacerta lepida, L. schreiberi and L. viridis) has been carried out. For this purpose, 11 osteometric vertebral parameters were proposed, and some of the parameters used by other authors were revised. The topographical variation of the most significant parameters were described and several indices based on them were elaborated. Lacerta viridis differs considerably from L. schreiberi and L. lepida, both qualitatively and quantitatively, especially in the positions of the maximum and minimum for each parameter, and in the percentage of general elongation of the presacral vertebrae, more marked in L. viridis than in the other two species. The sexual and ontogenetic variations include qualitative and quantitative differences as well. A greater percentage of elongation of presacral vertebrae exists in the females. There is some sexual correlation of the existence oscillations in certain parameters (for example pre-postzygapophysis distance) along the vertebral axis (L. lepida and L. schreiberi). The relative height of the neurapophysis shows the most important ontogenetic variation. It is progressively enhanced with size. The vertebral widening that occurs in the last presacral zone is more marked in immature individuals. An interspecific vertebral diagnosis (of particular importance in the axis and sacrum) is proposed.