Vulcan (Romanian pronunciation: [vulˈkan]; formerly Jiu-Vaidei-Vulcan; Hungarian: Vulkán, Zsilyvajdejvulkán (Zsily-Vajdej-Vulkán); German: Wolkendorf, Wulkan) is a city in Hunedoara County, Transylvania, Romania. With a population of 19,772 as of 2021, it is the second-largest city in the Jiu Valley. It administers two villages, Dealul Babii ("Old Woman's Hill" in Romanian; Hegyvulkán) and Jiu-Paroșeni (Zsilymacesdparoseny).