Temple of Diana, Roman temple in Aix-les-Bains, France.

The Temple of Diana is a Roman structure in Aix-les-Bains featuring a rectangular form with three fully preserved exterior walls that still stand today. Inside, the space holds archaeological finds that reveal details about daily life and beliefs during the Roman occupation of the region.

The structure was built during the first half of the 2nd century as a Roman temple and remains one of only three upright Roman temples surviving in France. Following the Roman period, it underwent several different uses that shaped its current form.

The name "Temple of Diana" is a traditional label that historians now doubt: the building is more likely a tomb-temple or mausoleum linked to the nearby Arch of Campanus, also reinterpreted as a funerary monument. Since 1948 it has housed the Aix-les-Bains archaeological museum, and its southern wall can be seen from inside the town hall.

The temple stands in the western part of place Maurice-Mollard, attached to the town hall, whose southern wall of the monument is visible from inside the building. The site lies in the historic centre, about 260 m above sea level on the western flank of Mont Revard, and can be reached on foot through the old town. Since 1948 it has housed the town's archaeological museum.

The name is misleading: historians now doubt it was a temple of Diana and read it as a tomb-temple or mausoleum, paired with the Campanus arch, itself reinterpreted as a funerary monument. Three exterior walls stand intact, and the building has housed the archaeological museum since 1948.