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Francesco I Sforza (Italian: [franˈtʃesko ˈpriːmo ˈsfɔrtsa]; 23 July 1401 – 8 March 1466) was an Italian condottiero who founded the Sforza dynasty in the duchy of Milan, ruling as its (fourth) duke from 1450 until his death. Renowned for his military skill and political acumen, he was among the few condottieri to successfully transform battlefield success into stable dynastic rule.

In the 1420s, he took part in the War of L'Aquila, and during the 1430s he served both the Papal States and the Duchy of Milan in their conflicts against Venice. Following the Peace of Cremona (1441), which he helped broker, Sforza married Bianca Maria Visconti, daughter of Duke Filippo Maria Visconti, thus strengthening his claim to Milan. After a brief military campaign in southern Italy with René of Anjou, he returned to Milan and seized control following the extinction of the Visconti line.

As duke, Sforza restored Milan's economic stability, improved the system of irrigation canals, and restructured the bureaucracy. He played a leading role in the establishment of the Treaty of Lodi (1454), which created a lasting balance of power among the Italian states and ushered in a period of relative peace.

He died in 1466 and was succeeded by his son, Galeazzo Maria Sforza. Although Francesco ruled with broad recognition, it was not until 1494 that his other son, Ludovico Sforza, received formal investiture as Duke of Milan by Emperor Maximilian I.