The Battle of Preveza was a naval engagement that took place on 28 September 1538 near Preveza in the Ionian Sea in northwestern Greece between an Ottoman fleet and that of a Holy League. The battle was an Ottoman victory which occurred in the same area in the Ionian Sea as the Battle of Actium in 31 BC. It was one of the three largest sea battles that took place in the sixteenth century Mediterranean, along with the Battle of Djerba and the Battle of Lepanto.