| Conflict: | Siege of Belgrade (1690) |
| Partof: | the Great Turkish War, the Ottoman–Habsburg wars, and the Polish–Ottoman War |
| Date: | 2–8 October 1690 |
| Place: | Belgrade, Ottoman Empire |
| Result: | Ottoman victory |
| Territory: | Ottomans capture Belgrade from the Holy Roman Empire. |
| Combatant1: | Ottoman Empire |
| Commander1: | Köprülü Fazıl Mustafa Pasha |
| Commander2: | Ferdinand Gobert von Aspremont-Lynden |
The siege of Belgrade in 1690 was the fifth siege of that city, taking place during the Great Turkish War.
Belgrade had been conquered by the Austrians under the elector of Bavaria, Maximilian II Emanuel, on September 6, 1688, after a five-week siege. Only 20 days later, King Louis XIV of France invaded the Rhineland, starting the Nine Years' War. This invasion made the Emperor stop all offensives in the Balkans and redirect the bulk of his army in the East towards the Rhine. This diversion allowed the Ottomans under Grand vizier Köprülü Fazıl Mustafa Pasha to regroup their army and retake the initiative. In 1690, the Ottomans recaptured Niš and by October 2 they had reached Belgrade.
The siege lasted for only six days, as the Austrians were forced to surrender when their main powder magazine was hit by a Turkish shell and exploded. Belgrade was then captured by the Ottomans.
The Turks would hold the city until the Austrians retook it in the 1717 siege.