The Battle of Magenta was fought on 4 June 1859 near the town of Magenta in the Kingdom of Lombardy–Venetia, a crown land of the Austrian Empire, during the Second Italian War of Independence. It resulted in a French-Sardinian victory under Napoleon III against the Austrians under Marshal Ferenc Gyulay.

Magenta is a town and comune in the Metropolitan City of Milan in Lombardy, northern Italy. It became notable as the site of the Battle of Magenta in 1859. The color magenta takes its name from the battle, most likely referring to the uniforms used by Zouave French troops.