The Treaty of Lodi, or Peace of Lodi, was a peace agreement to put an end to the Wars in Lombardy between the Venetian Republic and the Duchy of Milan, signed in the city of Lodi on 9 April 1454.

The Wars in Lombardy were a series of conflicts between the Republic of Venice and the Duchy of Milan and their respective allies, fought in four campaigns in a struggle for hegemony in Northern Italy that ravaged the economy of Lombardy. They lasted from 1423 until the signing of the Treaty of Lodi in 1454. During their course, the political structure of Italy was transformed: out of a competitive congeries of communes and city-states emerged the five major Italian territorial powers that would make up the map of Italy for the remainder of the 15th century and the beginning of the Italian Wars at the turn of the 16th century. They were Venice, Milan, Florence, the Papal States and Naples. Important cultural centers of Tuscany and Northern Italy—Siena, Pisa, Urbino, Mantua, Ferrara—became politically marginalized.