The Long Turkish War or Thirteen Years' War was an indecisive land war between 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 it is sometimes called the Fifteen Years War, reckoning from the 1591–92 Turkish campaign that captured Bihać. The major participants of the war were the Habsburg Monarchy, the Principality of Transylvania, Wallachia, and Moldavia opposing the Ottoman Empire. Ferrara, Tuscany, Mantua, and the Papal State were also involved to a lesser extent.

The Long War ended with the Peace of Zsitvatorok on November 11, 1606, with meagre territorial gains for the two main empires—the Ottomans won the fortresses of Eger, Esztergom, and Kanisza, but gave the region of Vác (which they had occupied since 1541) to Austria. The treaty confirmed the Ottomans' inability to penetrate further into Habsburg territories. It also demonstrated that Transylvania was beyond Habsburg power. The treaty stabilized conditions on the Habsburg–Ottoman frontier.