The War of L'Aquila (Italian: Guerra dell'Aquila) was a conflict in 15th-century Italy. It started in 1423 as a personal conflict against the condottiero Braccio da Montone and the city of L'Aquila in Abruzzo, but later turned into a national conflict when the forces of the Duchy of Milan, the Republic of Florence, the Papal States, and the Kingdom of Naples were also involved. Braccio da Montone was killed in the final battle near L'Aquila.