Battle of Placentia may refer to:

• Battle of Placentia (217 BC), fought between the Roman Republic and the Punics
• Battle of Placentia (194 BC), fought between the Roman Republic and the Boii
• Battle of Placentia (69), fought between forces of the Emperor Otho and his opponent Vitellius
• Battle of Placentia (271), fought Between the Roman Empire and the Juthungi
• Battle of Placentia (456), fought between forces of the Emperor Avitus and his opponents Majorian and Ricimer
• Battle of Placentia (1692), fought between the English and the French in Placentia, Newfoundland
• Battle of Piacenza (1746), fought between the Franco-Spanish and Austria