Benito Amilcare Andrea Mussolini (29 July 1883 – 28 April 1945) was an Italian politician and journalist who was the dictator of Italy during the Fascist era from the March on Rome in 1922 until his overthrow in 1943. He founded the National Fascist Party (PNF) and served as Prime Minister of Italy from 1922, later adopting the title Duce ("leader") of Italian fascism. Mussolini first organized the Italian Fasces of Combat in 1919, which evolved into the PNF that established a totalitarian regime. As the founder of fascism, Mussolini inspired the rise of similar movements across Europe during the interwar period.

Mussolini was originally a socialist politician and journalist at the Avanti! newspaper. In 1912, he became a member of the National Directorate of the Italian Socialist Party (PSI), but was expelled for advocating military intervention in World War I. In 1914, Mussolini founded a newspaper, Il Popolo d'Italia, and served in the Royal Italian Army until he was wounded and discharged in 1917. He eventually denounced the PSI, his views pivoting to focus on Italian nationalism, and founded the fascist movement which opposed egalitarianism and class conflict, instead advocating "revolutionary nationalism" transcending class lines. In October 1922, following the March on Rome, he was appointed prime minister by King Victor Emmanuel III. After removing opposition through his secret police and outlawing labour strikes, Mussolini and his followers consolidated power through laws that transformed the nation into a one-party dictatorship. Within five years, he established dictatorial authority by legal and illegal means and aspired to create a totalitarian state. In 1929, he signed the Lateran Treaty to establish Vatican City.

Mussolini's foreign policy was based on the fascist doctrine of spazio vitale ("living space"), which aimed to expand Italian possessions and have an Italian sphere of influence in southeastern Europe. In the 1920s, he ordered the Pacification of Libya and the bombing of Corfu over an incident with Greece, and his government annexed Fiume after a treaty with Yugoslavia. In 1936, Ethiopia was conquered following the Second Italo-Ethiopian War and merged into Italian East Africa (AOI) with Eritrea and Somalia. In 1939, Italian forces annexed Albania. Between 1936 and 1939, Mussolini ordered an intervention in Spain in favour of Francisco Franco, during the Spanish Civil War. Mussolini took part in the Treaty of Lausanne, Four-Power Pact and Stresa Front. However, he alienated the democratic powers as tensions grew in the League of Nations, which he left in 1937. Now hostile to France and Britain, Italy formed the Axis alliance with Nazi Germany and Imperial Japan.

The wars of the 1930s cost Italy enormous resources, leaving it unprepared for the Second World War; Mussolini initially declared Italy's non-belligerence. However, in June 1940, believing Allied defeat imminent, he joined the war on Germany's side, to share the spoils. After the tide turned, and the Allied invasion of Sicily, King Victor Emmanuel III dismissed Mussolini as head of government and placed him in custody in July 1943. After the king agreed to an armistice with the Allies in September 1943, Mussolini was rescued by Germany in the Gran Sasso raid. Adolf Hitler made Mussolini the figurehead of a puppet state in German-occupied north Italy, the Italian Social Republic, which served as a collaborationist regime of the Germans. With Allied victory imminent, Mussolini and mistress Clara Petacci attempted to flee to Switzerland, but were captured by communist partisans and executed on 28 April 1945.

Benito Amilcare Andrea Mussolini was born on 29 July 1883 in Dovia di Predappio, a small town in the province of Forlì in Romagna. During the Fascist era, Predappio was dubbed "Duce's town" and Forlì was called "Duce's city", with pilgrims going to Predappio and Forlì to see the birthplace of Mussolini.

Benito Mussolini's father, Alessandro Mussolini, was a blacksmith and a socialist, while his mother, Rosa (née Maltoni), was a devout Catholic schoolteacher. Given his father's political leanings, Mussolini was named Benito after liberal Mexican president Benito Juárez, while his middle names, Andrea and Amilcare, were for Italian socialists Andrea Costa and Amilcare Cipriani. In return his mother required that he be baptised at birth. Benito was followed by his siblings Arnaldo and Edvige. Mussolini's family was of comparatively humble status, and fascist biographers frequently emphasized that the dictator had "come from the people". Nevertheless, the family did not belong to the lowest social stratum, and Benito's father played a prominent role in regional politics, at one point holding the office of deputy mayor of Predappio.

As a young boy, Mussolini helped his father in his smithy. Mussolini's early political views were strongly influenced by his father, who idolised 19th-century Italian nationalist figures with humanist tendencies such as Carlo Pisacane, Giuseppe Mazzini, and Giuseppe Garibaldi. His father's political outlook combined views of anarchist figures such as Carlo Cafiero and Mikhail Bakunin, the military authoritarianism of Garibaldi, and the nationalism of Mazzini. In 1902, at the anniversary of Garibaldi's death, Mussolini made a public speech in praise of the republican nationalist.

Mussolini was sent to a boarding school in Faenza run by Salesians. Despite being shy, he often clashed with teachers and fellow boarders due to his proud, grumpy, and violent behaviour. During an argument, he injured a classmate with a penknife and was severely punished. After joining a new non-religious school in Forlimpopoli, Mussolini achieved good grades, was appreciated by his teachers despite his violent character, and qualified as an elementary schoolmaster in July 1901.