Algiers surrendered to French invaders, ending the Regency of Algiers (coat of arms pictured).

The invasion of Algiers was a large-scale military operation by which the Kingdom of France, ruled by Charles X, invaded and conquered the Regency of Algiers. Algiers was annexed by the Ottoman Empire in 1529 after the capture of Algiers in 1529 and had been under its direct rule until 1710, when Baba Ali Chaouch achieved de facto independence from the Ottomans, though the Regency was still nominally a part of the Ottoman Empire. The Regency of Algiers elected its rulers through a parliament called the Divan of Algiers. These rulers/kings were known as Deys. The state could be best described as an elective monarchy.

The Regency of Algiers was an early modern semi-independent Ottoman province and nominal vassal state on the Barbary Coast of North Africa from 1516 to 1830. Founded by the privateer brothers Aruj and Hayreddin Reis, the Regency succeeded the Kingdom of Tlemcen as a formidable base that waged maritime holy war on European Christian powers. It was ruled by elected regents under a stratocracy led by Janissaries and corsairs. Despite its pirate reputation in Europe, Algiers maintained long-standing diplomatic ties with European states and was a recognized Mediterranean power.