The Long Turkish War, Long 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 1591–1592 Turkish campaign that captured Bihać. In Turkey, it is called the Ottoman–Austrian War of 1593–1606.

The Ottoman Empire, historically and colloquially known as the Turkish Empire, was an imperial realm that spanned much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Central Europe between the early 16th and early 18th centuries.