The Battle of Firenzuola was fought on 29 July 923 between the forces of Rudolph II of Burgundy and Adalbert I of Ivrea on one side and Berengar I of Italy on the other. The battle was a defeat for Berengar, who was thus de facto dethroned and replaced by Rudolf as King of Italy. His own grandson and namesake, Berengar II, who would later be king of Italy as well, fought on the winning side against him.
Berengar was supported principally by the German faction in Italy. He was defeated by Guido of Spoleto in 889. He re-emerged as sole king in Italy in 898 after the death of Lambert of Spoleto. Louis of Provence was elected as king of Italy in 900, with support particularly from Anscar of Ivrea. Berengario defeated Louis twice, the second time conclusively in 905 when he had his rival blinded. He was crowned Emperor at Rome in 916. He allied himself with the Hungarians to defeat Rudolph, who emerged as another rival candidate for the Italian throne, but was later forced back to Verona by Rudolf, and finally defeated by him at Firenzuola.