| Conflict: | Siege of Kizlyar (August 1785) |
| Place: | Kizlyar fortress, North Caucasus Line, North Caucasia |
| Width: | 355px |
| Partof: | Sheikh Mansur Movement |
| Date: | 20–21 August 1785 |
| Result: | Russian victory |
| Combatant1: | Sheikh Mansur Movement |
| Commander1: | Sheikh Mansur Dol Mudarov |
| Commander2: | Ivan Veshnyakov Bekovich Cherkassky Ivan Lunin Peter Sekhin |
| Units1: | Unknown |
| Units2: | Tomsk Infantry Regiment Astrakhan Regiment Kizlyar Regiment Greben and Terek Cossacks ~Georgian, Armenian and Kalmyk civilian militias |
| Strength1: | 10,000–12,000 |
| Strength2: | ~3,220–3,720 Regulars ~Unknown amount of irregulars, Cossacks and civilian fighters |
| Casualties1: | 200–1,000 killed |
| Casualties2: | Unknown |
The siege of Kizlyar in August 1785 was the second and final attempt of Chechen forces and Kumyk allies led by Sheikh Mansur to capture the Kizlyar fortress.
After the defeat in Grigoripolis, the Kumyk people invited Sheikh Mansur to their country. With the support of Kumyk nobles, Mansur launched another attack on Kizlyar on 19 August 1785. During the siege, however, the Russians bribed some of the Kumyk princes, who turned against Mansur. As the latter began withdrawing his forces, he was ambushed by a Russian army, including an infantry regiment from Tomsk, which was coming to help, but Mansur managed to withdraw his forces without suffering many losses.