Italian unification, also known as the Risorgimento, meaning "the Resurgence"), is the political and social movement that consolidated different states of the Italian peninsula into the single state of the Kingdom of Italy in the nineteenth century.

The process begins in 1815 with the Congress of Vienna and is completed in 1871 when Rome becomes the capital of the Kingdom of Italy.

However, some of the terre irredente will not join the Kingdom of Italy until 1918 after Italy defeats Austria–Hungary in the First World War.

For this reason, sometimes the period is extended to include the late nineteenth-century and the First World War (1915–1918), until the November 4, 1918 Armistice of Villa Giusti, which is considered the completion of unification.

This view is followed, for example, at the Central Museum of Risorgimento at the Vittoriano.