Occupation of Monaco changes from French to Austrian.

Military occupation, also called belligerent occupation or simply occupation, is temporary hostile control exerted by a ruling power's military apparatus over a sovereign territory that is outside of the legal boundaries of that ruling power's own sovereign territory. The controlled territory is called occupied territory, and the ruling power is called the occupant. Occupation's intended temporary nature distinguishes it from annexation and colonialism. The occupant often establishes military rule to facilitate administration of the occupied territory, though this is not a necessary characteristic of occupation.

Monaco, officially the Principality of Monaco, is a sovereign city-state and microstate on the French Riviera a few kilometres west of the Italian region of Liguria, in Western Europe, on the Mediterranean Sea. It is a semi-enclave bordered by France to the north, east and west. The principality is home to nearly 39,000 residents as of the 2020s, of whom about 9,883 are Monégasque nationals. It is recognised as one of the wealthiest and most expensive places in the world. The official language of Monaco is French. Monégasque, English and Italian are also spoken and understood by many residents.