The Ottoman–Habsburg wars were fought from the 16th through the 18th centuries between the Ottoman Empire and the Habsburg monarchy, which was at times supported by the Kingdom of Hungary, Polish–Lithuanian Commonwealth, and Habsburg Spain. The wars were dominated by land campaigns in Hungary, including Transylvania (today in Romania) and Vojvodina (today in Serbia), Croatia, and central Serbia.

By the 16th century, the Ottomans had become a serious threat to the European powers, with Ottoman ships sweeping away Venetian possessions in the Aegean and Ionian seas and Ottoman-supported Barbary pirates seizing Spanish possessions in the Maghreb. The Protestant Reformation, French–Habsburg rivalry and the numerous civil conflicts of the Holy Roman Empire distracted the Christians from their conflict with the Ottomans. Meanwhile, the Ottomans had to contend with the Persian Safavid Empire and to a lesser extent the Mamluk Sultanate, which was defeated and fully incorporated into the empire.

Initially, Ottoman conquests in Europe made significant gains with a decisive victory at Mohács reducing around one third (central) part of the Kingdom of Hungary to the status of an Ottoman tributary. Later, the Peace of Westphalia and the Spanish War of Succession in the 17th and 18th centuries respectively left the Austrian Empire as the sole firm possession of the House of Habsburg. After the siege of Vienna in 1683, the Habsburgs assembled a large coalition of European powers known as the Holy League, allowing them to fight the Ottomans and to regain control over Hungary. The Great Turkish War ended with the decisive Holy League victory at Zenta. The wars ended after Austria's participation in the war of 1787-1791, which Austria fought allied with Russia. Intermittent tension between Austria and the Ottoman Empire continued throughout the nineteenth century, but they never fought each other in a war and ultimately found themselves allied in World War I, in the aftermath of which both empires were dissolved.