To investigate the dynamics of homologous disaccharide aqueous solutions, quasielastic neutron scattering (QENS) measurements were performed on trehalose and sucrose aqueous solutions at different temperatures. Neutron spectra were collected by using the spectrometer OSIRIS at the ISIS pulsed neutron source of the Rutheford Appleton Laboratory (Chilton, U.K.). The employment of H/D substitution allowed the separation of the diffusive dynamics of water from that of the disaccharide. The analysis of the trehalose transport properties suggests the existence of a transition between a hopping mechanism of the sugar molecules trapped inside cages formed by neighboring molecules, and a continuous diffusion. Moreover, the presence of disaccharides markedly influences, over all of the temperature range investigated, the dynamics of the hydration water determining a slowing down in comparison with the bulk water. This results in a more pronounced effect for the trehalose/H2O solution than for the sucrose one, so confirming previous QENS and NMR results.