Old Acropolis Museum, Archaeological museum on the Acropolis, Athens, Greece

The Old Acropolis Museum is a stone building set into a niche at the eastern edge of the Acropolis rock, most of it below the hilltop. Its walls are light grey and beige rectangular blocks, with diamond-pattern metal grilles over rectangular windows. Designed by Panagis Kalkos and built 1865–1874, it held finds from the Parthenon, Propylaea, Erechtheum and other sanctuaries.

The building was constructed between 1865 and 1874 under architect Panagis Kalkos and served as the city's main archaeological museum for over a century. Major renovations occurred in the 1950s to expand the facility for growing visitor numbers and collections.

The building once housed a major collection of sculptures, bronzes, and pottery from the hilltop's classical temples. Visitors could experience firsthand the artistic creations of ancient Athens that shaped Western culture across millennia.

The museum closed in 2007 and its entire collection was transferred to a modern facility located elsewhere in the city. Visitors seeking classical art and artifacts will find the same collection displayed more comprehensively at the newer location.

The building's drainage system caused unexpected damage to the Acropolis rock itself, which ultimately became the deciding factor to relocate the museum to a new location. This technical problem led to the construction of a purpose-built modern facility designed to protect the archaeological site.