The Roman-Germanic Museum (RGM, in German: Römisch-Germanisches Museum) is an archaeological museum in Cologne, Germany. It has a large collection of Roman artifacts from the Roman settlement of Colonia Claudia Ara Agrippinensium, on which modern Cologne is built. The museum protects the original site of a Roman town villa, from which a large Dionysus mosaic remains in its original place in the basement, and the related Roman Road just outside. In this respect the museum is an archaeological site.
The museum also has the task of preserving the Roman cultural heritage of Cologne, and therefore houses an extensive collection of Roman glass from funerals and burials and also exercises archaeological supervision over the construction of the Cologne underground.
