The Second Battle of Petrozsény was a World War I military engagement between Romanian forces on one side and Central Powers forces on the other side. It was part of the wider Battle of Transylvania and resulted in a Romanian victory.

The First Battle of Petrozsény was a military engagement fought between Romanian forces on one side and German forces on the other side. It was part of the 1916 Battle of Transylvania, itself part of the Romanian Campaign of World War I. This was a German attack which drove off the Romanian forces from the Transylvanian coal mining center of Petrozsény. Although a Romanian counterattack a few days later undid most of their gains, the main strategic objective of the Central Powers had been nevertheless achieved.