The Illyrian Provinces were an autonomous province of France during the First French Empire that existed under Napoleonic Rule from 1809 to 1814. The province encompassed modern-day Slovenia, Gorizia, Trieste, and parts of Croatia, Austria, and Montenegro. Its capital was Ljubljana (German: Laybach, Laibach) in Slovenia. It encompassed six départements, making it a relatively large portion of territorial France at the time. Parts of Croatia were split up into Civil Croatia and Military Croatia, the former served as a residential space for French immigrants and Croatian inhabitants and the latter as a military base to check the Ottoman Empire.

In 1809, Napoleon Bonaparte invaded the region with his Grande Armée after key wins during the War of the Fifth Coalition forced the Austrian Empire to cede parts of its territory. Integrating the land into France was Bonaparte's way of controlling Austria's access to the Mediterranean and Adriatic Sea and expanding his empire east. Bonaparte installed four governors to disseminate French bureaucracy, culture, and language. The most famous and influential governor was Auguste de Marmont, who undertook the bulk of Bonaparte's bidding in the area. Marmont was succeeded by Henri Gatien Bertrand (1811–12), Jean-Andoche Junot (1812–13), and Joseph Fouché (1813–14).

Marmont pushed the Code Napoléon throughout the area and led a vast infrastructural expansion. During 1810, the French authorities established the Écoles centrales in Croatia and Slovenia. Although the respective states were allowed to speak and work in their native languages, French was designated as the official language and much of the federal administration was conducted as such. French rule contributed significantly to the provinces even after the Austrian Empire recovered the area in 1814. Napoleon introduced a greater national self-confidence and awareness of freedoms, as well as numerous political reforms. He introduced equality before the law, compulsory military service for men, a uniform tax system, abolished certain tax privileges, introduced modern administration, separated church and state and nationalized the judiciary. French presence in this region saw to a diffusion of French culture and the creation of the Illyrian Movement.