Adolf Weissenberg (1790–1840) was a Bavarian architect and archaeologist. He was appointed by Otto of Greece as ephor of antiquities, overseeing all archaeology and archaeological sites in Greece, in 1833, but forced to resign in September 1834.
Weissenberg was born in 1790. From 1822, he lived in Rome. In June 1833, he was appointed as "Ephor of Antiquities" (Greek, Modern (1453-);: Ἔφορος τῶν ἀρχαιοτήτων|eforos ton archaiotiton) with responsibility for "the conservation, discovery and collection of the archaeological treasures of the kingdom". Three others were appointed with the title of 'sub-ephor' (Greek, Modern (1453-);: ὑποέφορος|hupoeforos): Kyriakos Pittakis, for central and northern Greece; Ludwig Ross, for the Peloponnese, and for the Aegean Islands.
On, Weissenberg was appointed to lead the Greek Archaeological Service, which had notionally been established by Governor Ioannis Kapodistrias in 1829 but lacked a formal administrative structure until then. Weissenberg's short tenure saw the passage of the Archaeological Law of 10/22 May 1834, which named all antiquities in Greece as the "national property of all the Greeks", asserted the ownership of the state over all archaeological sites not already on private land and created the core administrative structure of the Archaeological Service. Weissenberg drafted the law alongside the regent Georg Ludwig von Maurer.
Weissenberg was accused by Ross of lacking interest in antiquities, and had also attracted the enmity of Josef Ludwig von Armansperg, head of the regency council, by trying to organise opposition to his government alongside von Maurer. Both Weissenberg and von Maurer were sacked (along with Kokkonis) in September 1834 and recalled to Bavaria. In Weissenberg's stead, Ross was named as Ephor General of Antiquities, with Pittakis and Athanasios Iatridis as his assistants. Weissenberg died in 1840.