The Château de Diant is a castle in the commune of Diant in the Seine-et-Marne département of France.

The castle was originally constructed in the 13th century for a companion of Philippe Auguste, with additions and modifications in the 15th century and the first half of the 19th.

The castle has been protected since 1946 as a monument historique by the French Ministry of Culture. The gardens are also listed. The castle and gardens are privately owned and not open to the public.

• List of castles in France

Ministry of Culture:

• Base Mérimée: Château de Diant, Ministère français de la Culture. (in French)
• Base Mérimée: Château de Diant gardens, Ministère français de la Culture. (in French)

48°16′45″N 2°59′42″E / 48.27917°N 2.99500°E / 48.27917; 2.99500