Codogno (Italian pronunciation: [koˈdoɲɲo]; Lodigiano: Cudògn) is a town and comune of 15,868 inhabitants in the province of Lodi, Lombardy, northern Italy.

The Latin form of the name Codogna was "Cothoneum" and is believed to derive from the name of the consul Aurelius Cotta, conqueror of the Gauls, who inhabited these lands at that time.

In 1441, after long jurisdiction by the bishops of Lodi, the settlement was sold to the Venetian family Fagnani by Filippo Maria Visconti, the Duke of Milan and subsequently, in 1450, to Gian Giacomo Trivulzio under whom it was granted the status of borgo ("burg", a fortified town) by Francesco I Sforza.

During this time, Codogno had developed a thriving commercial life, and having a fiercely autonomous spirit, they wished to be independent of Trivulzio.

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