Benito Amilcare Andrea Mussolini, KSMOM GCTE (July 29, 1883, Predappio, Forlì, Italy – April 28, 1945, Giulino di Mezzegra, Italy) was an Italian politician who led the National Fascist Party and is credited with being one of the key figures in the creation of Fascism. He became the Prime Minister of Italy in 1922 and began using the title Il Duce by 1925. After 1936, his official title was "His Excellency Benito Mussolini, Head of Government, Duce of Fascism, and Founder of the Empire". Mussolini also created and held the supreme military rank of First Marshal of the Empire along with King Victor Emmanuel III of Italy, which gave him and the King joint supreme control over the military of Italy. Mussolini remained in power until he was replaced in 1943; for a short period after this until his death he was the leader of the Italian Social Republic.

Mussolini was among the founders of Italian Fascism, which included elements of nationalism, corporatism, national syndicalism, expansionism, social progress and anti-communism in combination with censorship of subversives and state propaganda. In the years following his creation of the fascist ideology, Mussolini influenced, or achieved admiration from, a wide variety of political figures.

Among the domestic achievements of Mussolini from the years 1924–1939 were: his public works programmes such as the taming of the Pontine Marshes, the improvement of job opportunities, and public transport. Mussolini also solved the Roman Question by concluding the Lateran Treaty between the Kingdom of Italy and the Holy See. He is also credited with securing economic success in Italy's colonies and commercial dependencies.