An arsenal is a place where arms and ammunition are made, maintained and repaired, stored, or issued, in any combination, whether privately or publicly owned. Arsenal and armoury or armory are mostly regarded as synonyms, although subtle differences in usage exist.

The Venetian Arsenal is a complex of former shipyards and armories clustered together in the city of Venice in northern Italy. Owned by the state, the Arsenal was responsible for the bulk of the Venetian Republic's naval power from the Late Middle Ages to the early modern period. It was "one of the earliest large-scale industrial enterprises in history".