The dynamical mechanical analysis (DMA) technique was used for the characterization of some recently manufactured and historical parchments and leathers. The obtained results were correlated with the DSC measurements performed for these biomaterials. We point out the suitability of the DMA method for distinguishing qualitatively between a recently manufactured leather and a patrimonial one, as well as for assessing the deterioration of the parchments and leathers as a result of natural ageing.