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The occurrence of internal tides along the Italian coastline of the Adriatic Sea during the stratification season is revealed by a high-resolution, state-of-the-art, three-dimensional primitive-equation baroclinic tidal ocean model of the Adriatic Sea. The important semi-diurnal and diurnal tidal components for the Adriatic Sea are simulated by imposing tidal elevations and velocities along the model domain’s southern boundary. The co- tidal charts and harmonics of tidal sea levels and phases of semi- diurnal and diurnal tides are well reproduced by the model, suggesting that the hydrodynamics key to tidal processes in the Adriatic are correctly represented. Vertical oscillations of isotherms near diurnal frequencies are evident at sites along the Italian coastline during the stratification season. Such vigorous oscillations are absent when the tidal forcing is removed. The occurrence of internal tides is readily explained by the supercritical slope theory.