French Prime Minister Edouard Philippe has ordered the closure of all non-essential public locations from midnight (23:00 GMT Saturday) in response to the coronavirus outbreak.
The measure applies to restaurants, cafes, cinemas and discos, as well as non-essential businesses.
Mr Philippe also called on French people to reduce their travel, especially between towns.
France reported a sharp rise in cases on Saturday, from 3,661 to 4,499.
Mr Philippe said the closure did not apply to essential businesses which he listed as food shops, chemists, banks, tobacco shops and petrol stations.