Zecca di Mediolanum, Ancient Roman mint and archaeological site in Milan, Italy.

The Zecca di Mediolanum was a Roman mint facility in Milan where ancient stone walls and foundations still remain today. The archaeological ruins were discovered beneath the former Bank of Italy building and reveal the structure of a workplace that produced coins for the empire.

The mint opened under Gallienus around 260 CE and struck the 23-type "legion series" of antoniniani. Aurelian closed it in 274 in favour of Ticinum, but Maximian reopened it around 290-291 when Mediolanum became his capital. Constantine I shut it again in 326-327, and Constantius II revived it in November 352. After 395 it supplied gold and silver for the northern provinces until it closed around 404, when the capital moved to Ravenna.

The mint produced coins bearing imperial portraits and symbols that reflected both the power and artistic values of Roman rule in the north. Coins from this facility served as small advertisements of imperial authority that traveled throughout the region.

The rectangular walls found in 1908 during construction of the Bank of Italy lie between Via Moneta and Via Armorari, aligned northwest to southeast like the nearby forum. The street name Via Moneta recalls the mint. The remains are underground and not freely accessible; entry is only through guided archaeological visits or temporary exhibitions.

Coins from this mint often carry the letters MD stamped on them, shorthand for Mediolanum that helps archaeologists trace where each coin was made. These markings act like fingerprints from antiquity, connecting the metal pieces directly to this northern Roman facility.