The Forest of Tronçais (French: Forêt de Tronçais, IPA: [tʁɔ̃sɛ]) is a national forest comprising 10,600 hectares (26,000 acres) in the Allier department of central France. It is managed by the National Forests Office (ONF). Its oaks, planted by Louis XIV's minister Jean-Baptiste Colbert to supply the French Navy, constitute one of the principal stands of oaks in Europe.
Within the forest boundaries are the communes of Braize, Cérilly, Isle-et-Bardais, Le Brethon, Meaulne-Vitray, Saint-Bonnet-Tronçais, Urçay and Valigny. It is mainly made up of sessile oak. It also contains 130 hectares (320 acres) of ponds and is deemed by many as the most beautiful oakwood in Europe.