Georg Gottfried Julius Dehio (November 22, 1850 in Reval (now Tallinn), Governorate of Estonia, Russian Empire – March 21, 1932 in Tübingen), was a Baltic German art historian (Kunsthistoriker).
In 1900, Dehio started the Handbuch der deutschen Kunstgeschichte (Handbook of German Art History). The project is ongoing and managed by the 'Dehio-Vereinigung', Munich.
He is the namesake of the Georg Dehio Prize (de:Georg-Dehio-Kulturpreis).