| Partof: | the Livonian campaign of Stephen Báthory in the Livonian War |
| Place: | Polotsk |
| Coordinates: | 55.4869°N 28.7608°W |
| Date: | August 11–30, 1579 |
| Combatant1: | Polish–Lithuanian Commonwealth |
| Combatant2: | Tsardom of Russia |
| Commander1: |
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| Commander2: |
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| Strength1: | Total Polotsk campaign 41,714 |
| Strength2: |
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| Casualties1: | At least 1,462 including dead, injured, deserted
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| Casualties2: | Up to 2,000 dead. All others captured and then released except commander and a few city elders. |
| Result: | Polish–Lithuanian victory |
| Territory: | Polish–Lithuanian Commonwealth captures Polotsk |
The siege of Polotsk (Russian: Осада Полоцка, Polish: Oblężenie Połocka, Belarusian: Аблога Полацка) was a siege by forces of the Polish–Lithuanian Commonwealth under Stefan Bathory on the Russian-held city of Polotsk. Polotsk had been captured and heavily fortified by the Russians under Ivan the Terrible in 1563 because the river Dwina, which led to the key city of Riga, flowed through it. Hungarian soldiers, led by Caspar Bekes, Polish soldiers, led by Mikolaj Mielecki, and Lithuanian soldiers, led by Mikolaj Radziwill, converged at the Dzisna fortress, joined Bathory's men, and moved on to Polotsk, with a total force of about 42,000. Polotsk had three fortresses: the central one, nearby Strelec fortress, and the walled town of Zapolochie. The primary focus was on the central fortress: first with artillery, which failed because it only punctured the wooden walls, then with cannons, and eventually with fire. The Russians defended Polotsk with trenches and artillery, but after the Hungarian contingent captured Zapolochie, the Russians surrendered. After taking the city, Bathory's forces then moved to besiege Velikiye Luki.