The Long Turkish War, or Thirteen Years' War, was an indecisive land war between the Holy Roman Empire (primarily the Habsburg monarchy) and the Ottoman Empire, primarily over the principalities of Wallachia, Transylvania, and Moldavia. It was waged from 1593 to 1606, but in Europe, especially in Hungary, it is called the Fifteen Years' War (Hungarian: tizenöt éves háború), reckoning from the 1591–1592 Turkish campaign that captured Bihać in the Kingdom of Croatia. In Turkey, it is called the Ottoman–Austrian War of 1593–1606 (Turkish: 1593–1606 Osmanlı-Avusturya Savaşı).
In the series of Ottoman wars in Europe, it was the major test of force in the time period between the Ottoman–Venetian War (1570–1573) and the Cretan War (1645–1669). The next of the major Ottoman–Habsburg wars was that of 1663–1664. Though the conflict featured a large number of costly battles and sieges, it produced little gain for either side.