Mortefontaine () is a commune in the Oise department in Northern France.
The 17th-century Château de Mortefontaine was bought by Joseph Bonaparte,Castle of Mortefontaine on the Napoleon & Empire website. elder brother of Napoléon Bonaparte, in 1798. The Convention of 1800 (also known as the Treaty of Mortefontaine), a friendship treaty between France and the United States, was signed in the castle. The preliminaries of the 1802 Peace of Amiens were also negotiated there.
See also Communes of the Oise department
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